21310288886 has 4 divisors (see below), whose sum is σ = 31965433332. Its totient is φ = 10655144442.

The previous prime is 21310288843. The next prime is 21310288897. The reversal of 21310288886 is 68888201312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21310288886.

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, 5327572220 + ... + 5327572223.

It is an arithmetic number, because the mean of its divisors is an integer number (7991358333).

Almost surely, 2^21310288886 is an apocalyptic number.

21310288886 is a deficient number, since it is larger than the sum of its proper divisors (10655144446).

21310288886 is a wasteful number, since it uses less digits than its factorization.

21310288886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655144445.

The product of its (nonzero) digits is 294912, while the sum is 47.

The spelling of 21310288886 in words is "twenty-one billion, three hundred ten million, two hundred eighty-eight thousand, eight hundred eighty-six".