21057520603 has 16 divisors (see below), whose sum is σ = 24387201216. Its totient is φ = 17809430400.

The previous prime is 21057520573. The next prime is 21057520607. The reversal of 21057520603 is 30602575012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21057520603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21057520607) 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 15 ways as a sum of consecutive naturals, for example, 156325 + ... + 257977.

It is an arithmetic number, because the mean of its divisors is an integer number (1524200076).

Almost surely, 2^21057520603 is an apocalyptic number.

21057520603 is a deficient number, since it is larger than the sum of its proper divisors (3329680613).

21057520603 is a wasteful number, since it uses less digits than its factorization.

21057520603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102054.

The product of its (nonzero) digits is 12600, while the sum is 31.

The spelling of 21057520603 in words is "twenty-one billion, fifty-seven million, five hundred twenty thousand, six hundred three".