21964917902 has 8 divisors (see below), whose sum is σ = 32997834216. Its totient is φ = 10965639832.

The previous prime is 21964917851. The next prime is 21964917917. The reversal of 21964917902 is 20971946912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 8407928 + ... + 8410539.

It is an arithmetic number, because the mean of its divisors is an integer number (4124729277).

Almost surely, 2^21964917902 is an apocalyptic number.

21964917902 is a deficient number, since it is larger than the sum of its proper divisors (11032916314).

21964917902 is a wasteful number, since it uses less digits than its factorization.

21964917902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16819122.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 21964917902 in words is "twenty-one billion, nine hundred sixty-four million, nine hundred seventeen thousand, nine hundred two".