21281112860 has 48 divisors (see below), whose sum is σ = 51098234880. Its totient is φ = 7293015360.

The previous prime is 21281112851. The next prime is 21281112863. The reversal of 21281112860 is 6821118212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21281112863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279515 + ... + 347405.

It is an arithmetic number, because the mean of its divisors is an integer number (1064546560).

Almost surely, 2^21281112860 is an apocalyptic number.

21281112860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21281112860 is an abundant number, since it is smaller than the sum of its proper divisors (29817122020).

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

21281112860 is a wasteful number, since it uses less digits than its factorization.

21281112860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70146 (or 70144 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 32.

The spelling of 21281112860 in words is "twenty-one billion, two hundred eighty-one million, one hundred twelve thousand, eight hundred sixty".