21320755116 has 24 divisors (see below), whose sum is σ = 50065302000. Its totient is φ = 7061650752.

The previous prime is 21320755069. The next prime is 21320755117. The reversal of 21320755116 is 61155702312.

It is not an unprimeable number, because it can be changed into a prime (21320755117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5656491 + ... + 5660258.

It is an arithmetic number, because the mean of its divisors is an integer number (2086054250).

Almost surely, 2^21320755116 is an apocalyptic number.

It is an amenable number.

21320755116 is an abundant number, since it is smaller than the sum of its proper divisors (28744546884).

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

21320755116 is a wasteful number, since it uses less digits than its factorization.

21320755116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11316913 (or 11316911 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The spelling of 21320755116 in words is "twenty-one billion, three hundred twenty million, seven hundred fifty-five thousand, one hundred sixteen".