21269588992 has 44 divisors (see below), whose sum is σ = 42931419856. Its totient is φ = 10531491840.

The previous prime is 21269588911. The next prime is 21269588993. The reversal of 21269588992 is 29988596212.

It is a self number, because there is not a number n which added to its sum of digits gives 21269588992.

It is not an unprimeable number, because it can be changed into a prime (21269588993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4642 + ... + 206302.

Almost surely, 2^21269588992 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 21269588992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21465709928).

21269588992 is an abundant number, since it is smaller than the sum of its proper divisors (21661830864).

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

21269588992 is a wasteful number, since it uses less digits than its factorization.

21269588992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201784 (or 201766 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 61.

The spelling of 21269588992 in words is "twenty-one billion, two hundred sixty-nine million, five hundred eighty-eight thousand, nine hundred ninety-two".