10992581621 has 4 divisors (see below), whose sum is σ = 12562950432. Its totient is φ = 9422212812.

The previous prime is 10992581609. The next prime is 10992581629. The reversal of 10992581621 is 12618529901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10992581621 - 2²⁶ = 10925472757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10992581629) 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, 785184395 + ... + 785184408.

It is an arithmetic number, because the mean of its divisors is an integer number (3140737608).

Almost surely, 2^10992581621 is an apocalyptic number.

It is an amenable number.

10992581621 is a deficient number, since it is larger than the sum of its proper divisors (1570368811).

10992581621 is an equidigital number, since it uses as much as digits as its factorization.

10992581621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570368810.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 10992581621 in words is "ten billion, nine hundred ninety-two million, five hundred eighty-one thousand, six hundred twenty-one".