21507657042003 has 32 divisors (see below), whose sum is σ = 31310906711040. Its totient is φ = 13023680087040.

The previous prime is 21507657041971. The next prime is 21507657042023. The reversal of 21507657042003 is 30024075670512.

It is not a de Polignac number, because 21507657042003 - 2⁵ = 21507657041971 is a prime.

It is a super-2 number, since 2×21507657042003² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21507657042023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235708993 + ... + 235800221.

It is an arithmetic number, because the mean of its divisors is an integer number (978465834720).

Almost surely, 2^{21507657042003} is an apocalyptic number.

21507657042003 is a deficient number, since it is larger than the sum of its proper divisors (9803249669037).

21507657042003 is a wasteful number, since it uses less digits than its factorization.

21507657042003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97339.

The product of its (nonzero) digits is 352800, while the sum is 42.

The spelling of 21507657042003 in words is "twenty-one trillion, five hundred seven billion, six hundred fifty-seven million, forty-two thousand, three".