21885018902 has 4 divisors (see below), whose sum is σ = 32827528356. Its totient is φ = 10942509450.

The previous prime is 21885018893. The next prime is 21885018931. The reversal of 21885018902 is 20981058812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5471254724 + ... + 5471254727.

It is an arithmetic number, because the mean of its divisors is an integer number (8206882089).

Almost surely, 2^21885018902 is an apocalyptic number.

21885018902 is a deficient number, since it is larger than the sum of its proper divisors (10942509454).

21885018902 is a wasteful number, since it uses less digits than its factorization.

21885018902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10942509453.

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 21885018902 in words is "twenty-one billion, eight hundred eighty-five million, eighteen thousand, nine hundred two".