21320056770 has 32 divisors (see below), whose sum is σ = 53392839552. Its totient is φ = 5438159232.

The previous prime is 21320056757. The next prime is 21320056781. The reversal of 21320056770 is 7765002312.

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, 15448627 + ... + 15450006.

It is an arithmetic number, because the mean of its divisors is an integer number (1668526236).

Almost surely, 2^21320056770 is an apocalyptic number.

21320056770 is an abundant number, since it is smaller than the sum of its proper divisors (32072782782).

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

21320056770 is a wasteful number, since it uses less digits than its factorization.

21320056770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30898666.

The product of its (nonzero) digits is 17640, while the sum is 33.

The spelling of 21320056770 in words is "twenty-one billion, three hundred twenty million, fifty-six thousand, seven hundred seventy".