21711334956 has 12 divisors (see below), whose sum is σ = 50659781592. Its totient is φ = 7237111648.

The previous prime is 21711334949. The next prime is 21711334961. The reversal of 21711334956 is 65943311712.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904638945 + ... + 904638968.

It is an arithmetic number, because the mean of its divisors is an integer number (4221648466).

Almost surely, 2^21711334956 is an apocalyptic number.

It is an amenable number.

21711334956 is an abundant number, since it is smaller than the sum of its proper divisors (28948446636).

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

21711334956 is a wasteful number, since it uses less digits than its factorization.

21711334956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809277920 (or 1809277918 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The spelling of 21711334956 in words is "twenty-one billion, seven hundred eleven million, three hundred thirty-four thousand, nine hundred fifty-six".