21535002204500 has 48 divisors (see below), whose sum is σ = 47032979994000. Its totient is φ = 8613902864000.

The previous prime is 21535002204451. The next prime is 21535002204511. The reversal of 21535002204500 is 540220053512.

It can be written as a sum of positive squares in 8 ways, for example, as 6596452542736 + 14938549661764 = 2568356^2 + 3865042^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57186830 + ... + 57562170.

It is an arithmetic number, because the mean of its divisors is an integer number (979853749875).

Almost surely, 2^{21535002204500} is an apocalyptic number.

21535002204500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21535002204500 is an abundant number, since it is smaller than the sum of its proper divisors (25497977789500).

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

21535002204500 is a wasteful number, since it uses less digits than its factorization.

21535002204500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490109 (or 490097 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 21535002204500 in words is "twenty-one trillion, five hundred thirty-five billion, two million, two hundred four thousand, five hundred".