21530503504056 has 32 divisors (see below), whose sum is σ = 54629635760640. Its totient is φ = 7069717567968.

The previous prime is 21530503504039. The next prime is 21530503504073. The reversal of 21530503504056 is 65040530503512.

It is an interprime number because it is at equal distance from previous prime (21530503504039) and next prime (21530503504073).

It is a super-2 number, since 2×21530503504056² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6694806696 + ... + 6694809911.

It is an arithmetic number, because the mean of its divisors is an integer number (1707176117520).

Almost surely, 2^{21530503504056} is an apocalyptic number.

It is an amenable number.

21530503504056 is an abundant number, since it is smaller than the sum of its proper divisors (33099132256584).

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

21530503504056 is a wasteful number, since it uses less digits than its factorization.

21530503504056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13389616683 (or 13389616679 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 21530503504056 in words is "twenty-one trillion, five hundred thirty billion, five hundred three million, five hundred four thousand, fifty-six".