21185060992 has 64 divisors (see below), whose sum is σ = 43387905240. Its totient is φ = 10296115200.

The previous prime is 21185060987. The next prime is 21185061031. The reversal of 21185060992 is 29906058112.

It can be written as a sum of positive squares in 4 ways, for example, as 19081554496 + 2103506496 = 138136^2 + 45864^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7561992 + ... + 7564792.

Almost surely, 2^21185060992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21185060992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21693952620).

21185060992 is an abundant number, since it is smaller than the sum of its proper divisors (22202844248).

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

21185060992 is a wasteful number, since it uses less digits than its factorization.

21185060992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449 (or 4437 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 21185060992 in words is "twenty-one billion, one hundred eighty-five million, sixty thousand, nine hundred ninety-two".