21244644620 has 12 divisors (see below), whose sum is σ = 44613753744. Its totient is φ = 8497857840.

The previous prime is 21244644611. The next prime is 21244644671. The reversal of 21244644620 is 2644644212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531116096 + ... + 531116135.

It is an arithmetic number, because the mean of its divisors is an integer number (3717812812).

Almost surely, 2^21244644620 is an apocalyptic number.

21244644620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21244644620 is an abundant number, since it is smaller than the sum of its proper divisors (23369109124).

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

21244644620 is a wasteful number, since it uses less digits than its factorization.

21244644620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062232240 (or 1062232238 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 35.

The spelling of 21244644620 in words is "twenty-one billion, two hundred forty-four million, six hundred forty-four thousand, six hundred twenty".