21711019944 has 16 divisors (see below), whose sum is σ = 54277549920. Its totient is φ = 7237006640.

The previous prime is 21711019943. The next prime is 21711019961. The reversal of 21711019944 is 44991011712.

It is not an unprimeable number, because it can be changed into a prime (21711019943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452312892 + ... + 452312939.

It is an arithmetic number, because the mean of its divisors is an integer number (3392346870).

Almost surely, 2^21711019944 is an apocalyptic number.

21711019944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21711019944 is an abundant number, since it is smaller than the sum of its proper divisors (32566529976).

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

21711019944 is a wasteful number, since it uses less digits than its factorization.

21711019944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904625840 (or 904625836 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The spelling of 21711019944 in words is "twenty-one billion, seven hundred eleven million, nineteen thousand, nine hundred forty-four".