21107742216 has 32 divisors (see below), whose sum is σ = 57566570400. Its totient is φ = 6396285440.

The previous prime is 21107742077. The next prime is 21107742239. The reversal of 21107742216 is 61224770112.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39976521 + ... + 39977048.

It is an arithmetic number, because the mean of its divisors is an integer number (1798955325).

Almost surely, 2^21107742216 is an apocalyptic number.

It is an amenable number.

21107742216 is an abundant number, since it is smaller than the sum of its proper divisors (36458828184).

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

21107742216 is a wasteful number, since it uses less digits than its factorization.

21107742216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79953589 (or 79953585 counting only the distinct ones).

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

The spelling of 21107742216 in words is "twenty-one billion, one hundred seven million, seven hundred forty-two thousand, two hundred sixteen".