21215914260 has 48 divisors (see below), whose sum is σ = 59422809600. Its totient is φ = 5655839104.

The previous prime is 21215914241. The next prime is 21215914309. The reversal of 21215914260 is 6241951212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148906 + ... + 254174.

It is an arithmetic number, because the mean of its divisors is an integer number (1237975200).

Almost surely, 2^21215914260 is an apocalyptic number.

21215914260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21215914260 is an abundant number, since it is smaller than the sum of its proper divisors (38206895340).

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

21215914260 is a wasteful number, since it uses less digits than its factorization.

21215914260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108640 (or 108638 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 21215914260 in words is "twenty-one billion, two hundred fifteen million, nine hundred fourteen thousand, two hundred sixty".