21720614712 has 64 divisors (see below), whose sum is σ = 57396979200. Its totient is φ = 6830645760.

The previous prime is 21720614633. The next prime is 21720614743. The reversal of 21720614712 is 21741602712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11073 + ... + 208719.

It is an arithmetic number, because the mean of its divisors is an integer number (896827800).

Almost surely, 2^21720614712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21720614712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28698489600).

21720614712 is an abundant number, since it is smaller than the sum of its proper divisors (35676364488).

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

21720614712 is a wasteful number, since it uses less digits than its factorization.

21720614712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197916 (or 197912 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The spelling of 21720614712 in words is "twenty-one billion, seven hundred twenty million, six hundred fourteen thousand, seven hundred twelve".