21121501260 has 96 divisors (see below), whose sum is σ = 59511920832. Its totient is φ = 5597102080.

The previous prime is 21121501253. The next prime is 21121501283. The reversal of 21121501260 is 6210512112.

It is a super-2 number, since 2×21121501260² (a number of 21 digits) contains 22 as substring.

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, 8960002 + ... + 8962358.

It is an arithmetic number, because the mean of its divisors is an integer number (619915842).

Almost surely, 2^21121501260 is an apocalyptic number.

21121501260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121501260 is an abundant number, since it is smaller than the sum of its proper divisors (38390419572).

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

21121501260 is a wasteful number, since it uses less digits than its factorization.

21121501260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243 (or 3241 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The spelling of 21121501260 in words is "twenty-one billion, one hundred twenty-one million, five hundred one thousand, two hundred sixty".