21969192 has 32 divisors (see below), whose sum is σ = 62769600. Its totient is φ = 6276864.

The previous prime is 21969191. The next prime is 21969193. The reversal of 21969192 is 29196912.

It is an interprime number because it is at equal distance from previous prime (21969191) and next prime (21969193).

It is a self number, because there is not a number n which added to its sum of digits gives 21969192.

It is not an unprimeable number, because it can be changed into a prime (21969191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65217 + ... + 65552.

It is an arithmetic number, because the mean of its divisors is an integer number (1961550).

Almost surely, 2^21969192 is an apocalyptic number.

It is an amenable number.

21969192 is an abundant number, since it is smaller than the sum of its proper divisors (40800408).

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

21969192 is a wasteful number, since it uses less digits than its factorization.

21969192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130785 (or 130781 counting only the distinct ones).

The product of its digits is 17496, while the sum is 39.

The square root of 21969192 is about 4687.1304654340. The cubic root of 21969192 is about 280.0730761646.

The spelling of 21969192 in words is "twenty-one million, nine hundred sixty-nine thousand, one hundred ninety-two".