21530503504055 has 96 divisors (see below), whose sum is σ = 32552765481600. Its totient is φ = 13549869527040.

The previous prime is 21530503504039. The next prime is 21530503504073. The reversal of 21530503504055 is 55040530503512.

It is not a de Polignac number, because 21530503504055 - 2⁴ = 21530503504039 is a prime.

It is a super-2 number, since 2×21530503504055² (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 95 ways as a sum of consecutive naturals, for example, 938668547 + ... + 938691483.

It is an arithmetic number, because the mean of its divisors is an integer number (339091307100).

Almost surely, 2^{21530503504055} is an apocalyptic number.

21530503504055 is a deficient number, since it is larger than the sum of its proper divisors (11022261977545).

21530503504055 is a wasteful number, since it uses less digits than its factorization.

21530503504055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24649 (or 24642 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 38.

The spelling of 21530503504055 in words is "twenty-one trillion, five hundred thirty billion, five hundred three million, five hundred four thousand, fifty-five".