21548072992 has 12 divisors (see below), whose sum is σ = 42422768766. Its totient is φ = 10774036480.

The previous prime is 21548072983. The next prime is 21548072993. The reversal of 21548072992 is 29927084512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11175872656 + 10372200336 = 105716^2 + 101844^2 .

It is not an unprimeable number, because it can be changed into a prime (21548072993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336688609 + ... + 336688672.

Almost surely, 2^21548072992 is an apocalyptic number.

It is an amenable number.

21548072992 is a deficient number, since it is larger than the sum of its proper divisors (20874695774).

21548072992 is an equidigital number, since it uses as much as digits as its factorization.

21548072992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673377291 (or 673377283 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 21548072992 in words is "twenty-one billion, five hundred forty-eight million, seventy-two thousand, nine hundred ninety-two".