21967449492 has 12 divisors (see below), whose sum is σ = 51257382176. Its totient is φ = 7322483160.

The previous prime is 21967449479. The next prime is 21967449509. The reversal of 21967449492 is 29494476912.

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

It is a congruent number.

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, 915310384 + ... + 915310407.

Almost surely, 2^21967449492 is an apocalyptic number.

It is an amenable number.

21967449492 is an abundant number, since it is smaller than the sum of its proper divisors (29289932684).

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

21967449492 is a wasteful number, since it uses less digits than its factorization.

21967449492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830620798 (or 1830620796 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 57.

The spelling of 21967449492 in words is "twenty-one billion, nine hundred sixty-seven million, four hundred forty-nine thousand, four hundred ninety-two".