21991202417796 has 12 divisors (see below), whose sum is σ = 51312805641552. Its totient is φ = 7330400805928.

The previous prime is 21991202417777. The next prime is 21991202417803. The reversal of 21991202417796 is 69771420219912.

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

It is a super-2 number, since 2×21991202417796² (a number of 27 digits) contains 22 as substring.

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, 916300100730 + ... + 916300100753.

It is an arithmetic number, because the mean of its divisors is an integer number (4276067136796).

Almost surely, 2^{21991202417796} is an apocalyptic number.

It is an amenable number.

21991202417796 is an abundant number, since it is smaller than the sum of its proper divisors (29321603223756).

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

21991202417796 is a wasteful number, since it uses less digits than its factorization.

21991202417796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832600201490 (or 1832600201488 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 60.

The spelling of 21991202417796 in words is "twenty-one trillion, nine hundred ninety-one billion, two hundred two million, four hundred seventeen thousand, seven hundred ninety-six".