21988824814 has 16 divisors (see below), whose sum is σ = 36591575040. Its totient is φ = 9825514360.

The previous prime is 21988824797. The next prime is 21988824821. The reversal of 21988824814 is 41842888912.

It is a happy number.

It is a congruent number.

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, 8468974 + ... + 8471569.

It is an arithmetic number, because the mean of its divisors is an integer number (2286973440).

Almost surely, 2^21988824814 is an apocalyptic number.

21988824814 is a deficient number, since it is larger than the sum of its proper divisors (14602750226).

21988824814 is a wasteful number, since it uses less digits than its factorization.

21988824814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16940615.

The product of its digits is 2359296, while the sum is 55.

The spelling of 21988824814 in words is "twenty-one billion, nine hundred eighty-eight million, eight hundred twenty-four thousand, eight hundred fourteen".