21121553310 has 64 divisors (see below), whose sum is σ = 59553930240. Its totient is φ = 4726500480.

The previous prime is 21121553309. The next prime is 21121553329. The reversal of 21121553310 is 1335512112.

It is a super-2 number, since 2×21121553310² (a number of 21 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 31 ways as a sum of consecutive naturals, for example, 2457430 + ... + 2466009.

It is an arithmetic number, because the mean of its divisors is an integer number (930530160).

Almost surely, 2^21121553310 is an apocalyptic number.

21121553310 is an abundant number, since it is smaller than the sum of its proper divisors (38432376930).

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

21121553310 is a wasteful number, since it uses less digits than its factorization.

21121553310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923473.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21121553310 in words is "twenty-one billion, one hundred twenty-one million, five hundred fifty-three thousand, three hundred ten".