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21020120212 = 22713157367819
BaseRepresentation
bin10011100100111001…
…011001010010010100
32000020221001202002211
4103210321121102110
5321022122321322
613353450043204
71342620034210
oct234471312224
960227052084
1021020120212
118a07345483
1240a7719504
131c9cb3ab70
14103598d940
158305c3b77
hex4e4e59494

21020120212 has 48 divisors (see below), whose sum is σ = 45562599040. Its totient is φ = 8262663552.

The previous prime is 21020120167. The next prime is 21020120213. The reversal of 21020120212 is 21202102012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21020120192 and 21020120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020120213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126762 + ... + 241057.

Almost surely, 221020120212 is an apocalyptic number.

It is an amenable number.

21020120212 is an abundant number, since it is smaller than the sum of its proper divisors (24542478828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020120212 is a wasteful number, since it uses less digits than its factorization.

21020120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368000 (or 367998 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020120212 its reverse (21202102012), we get a palindrome (42222222224).

The spelling of 21020120212 in words is "twenty-one billion, twenty million, one hundred twenty thousand, two hundred twelve".

Divisors: 1 2 4 7 13 14 26 28 52 91 157 182 314 364 628 1099 2041 2198 4082 4396 8164 14287 28574 57148 367819 735638 1471276 2574733 4781647 5149466 9563294 10298932 19126588 33471529 57747583 66943058 115495166 133886116 230990332 404233081 750718579 808466162 1501437158 1616932324 3002874316 5255030053 10510060106 21020120212