21961110916 has 12 divisors (see below), whose sum is σ = 38433639888. Its totient is φ = 10980070952.

The previous prime is 21961110893. The next prime is 21961110967. The reversal of 21961110916 is 61901116912.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7246 + ... + 209701.

It is an arithmetic number, because the mean of its divisors is an integer number (3202803324).

Almost surely, 2^21961110916 is an apocalyptic number.

It is an amenable number.

21961110916 is a deficient number, since it is larger than the sum of its proper divisors (16472528972).

21961110916 is a wasteful number, since it uses less digits than its factorization.

21961110916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242258 (or 242256 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 21961110916 in words is "twenty-one billion, nine hundred sixty-one million, one hundred ten thousand, nine hundred sixteen".