21515531053100 has 144 divisors (see below), whose sum is σ = 55863512006400. Its totient is φ = 7036570302720.

The previous prime is 21515531053099. The next prime is 21515531053111. The reversal of 21515531053100 is 135013551512.

It is a super-2 number, since 2×21515531053100² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4699910 + ... + 8069709.

It is an arithmetic number, because the mean of its divisors is an integer number (387941055600).

Almost surely, 2^{21515531053100} is an apocalyptic number.

21515531053100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21515531053100 is an abundant number, since it is smaller than the sum of its proper divisors (34347980953300).

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

21515531053100 is a wasteful number, since it uses less digits than its factorization.

21515531053100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769752 (or 12769745 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 32.

The spelling of 21515531053100 in words is "twenty-one trillion, five hundred fifteen billion, five hundred thirty-one million, fifty-three thousand, one hundred".