21711929814 has 24 divisors (see below), whose sum is σ = 49809722040. Its totient is φ = 6811585728.

The previous prime is 21711929803. The next prime is 21711929821. The reversal of 21711929814 is 41892911712.

It is a self number, because there is not a number n which added to its sum of digits gives 21711929814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35476704 + ... + 35477315.

It is an arithmetic number, because the mean of its divisors is an integer number (2075405085).

Almost surely, 2^21711929814 is an apocalyptic number.

21711929814 is an abundant number, since it is smaller than the sum of its proper divisors (28097792226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21711929814 is a wasteful number, since it uses less digits than its factorization.

21711929814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70954044 (or 70954041 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The spelling of 21711929814 in words is "twenty-one billion, seven hundred eleven million, nine hundred twenty-nine thousand, eight hundred fourteen".