Search a number
-
+
21155055016 = 234059165147
BaseRepresentation
bin10011101100111100…
…001000010110101000
32000121022222010212011
4103230330020112220
5321311143230031
613415110125304
71346146000144
oct235474102650
960538863764
1021155055016
118a76527a47
124124950834
131cc1a93844
141049876224
1583c3796b1
hex4ecf085a8

21155055016 has 16 divisors (see below), whose sum is σ = 39667314240. Its totient is φ = 10577104560.

The previous prime is 21155055013. The next prime is 21155055079. The reversal of 21155055016 is 61055055112.

It is not an unprimeable number, because it can be changed into a prime (21155055013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292155 + ... + 357301.

It is an arithmetic number, because the mean of its divisors is an integer number (2479207140).

Almost surely, 221155055016 is an apocalyptic number.

It is an amenable number.

21155055016 is a deficient number, since it is larger than the sum of its proper divisors (18512259224).

21155055016 is a wasteful number, since it uses less digits than its factorization.

21155055016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105744 (or 105740 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 21155055016 in words is "twenty-one billion, one hundred fifty-five million, fifty-five thousand, sixteen".

Divisors: 1 2 4 8 40591 65147 81182 130294 162364 260588 324728 521176 2644381877 5288763754 10577527508 21155055016