21070215716 has 24 divisors (see below), whose sum is σ = 40775990304. Its totient is φ = 9446172480.

The previous prime is 21070215713. The next prime is 21070215781. The reversal of 21070215716 is 61751207012.

It is not an unprimeable number, because it can be changed into a prime (21070215713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3276710 + ... + 3283133.

It is an arithmetic number, because the mean of its divisors is an integer number (1698999596).

Almost surely, 2^21070215716 is an apocalyptic number.

It is an amenable number.

21070215716 is a deficient number, since it is larger than the sum of its proper divisors (19705774588).

21070215716 is a wasteful number, since it uses less digits than its factorization.

21070215716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559931 (or 6559929 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

The spelling of 21070215716 in words is "twenty-one billion, seventy million, two hundred fifteen thousand, seven hundred sixteen".