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200021202121 = 1321183557409
BaseRepresentation
bin1011101001001000110…
…0010101010011001001
3201010021211011212100011
42322102030111103021
511234120411431441
6231515524311521
720310466110526
oct2722214252311
9633254155304
10200021202121
1177912832714
12329228425a1
1315b28833800
149976c4014d
15530a261581
hex2e923154c9

200021202121 has 6 divisors (see below), whose sum is σ = 216591006030. Its totient is φ = 184634955648.

The previous prime is 200021202119. The next prime is 200021202127. The reversal of 200021202121 is 121202120002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1002608896 + 199018593225 = 31664^2 + 446115^2 .

It is not a de Polignac number, because 200021202121 - 21 = 200021202119 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200021202127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591778536 + ... + 591778873.

It is an arithmetic number, because the mean of its divisors is an integer number (36098501005).

Almost surely, 2200021202121 is an apocalyptic number.

It is an amenable number.

200021202121 is a deficient number, since it is larger than the sum of its proper divisors (16569803909).

200021202121 is a wasteful number, since it uses less digits than its factorization.

200021202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183557435 (or 1183557422 counting only the distinct ones).

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

Adding to 200021202121 its reverse (121202120002), we get a palindrome (321223322123).

The spelling of 200021202121 in words is "two hundred billion, twenty-one million, two hundred two thousand, one hundred twenty-one".

Divisors: 1 13 169 1183557409 15386246317 200021202121