21948492 has 12 divisors (see below), whose sum is σ = 51213176. Its totient is φ = 7316160.

The previous prime is 21948469. The next prime is 21948497. The reversal of 21948492 is 29484912.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21948492.

It is not an unprimeable number, because it can be changed into a prime (21948497) 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, 914509 + ... + 914532.

Almost surely, 2^21948492 is an apocalyptic number.

It is an amenable number.

21948492 is an abundant number, since it is smaller than the sum of its proper divisors (29264684).

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

21948492 is a wasteful number, since it uses less digits than its factorization.

21948492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829048 (or 1829046 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 21948492 is about 4684.9217709584. The cubic root of 21948492 is about 279.9850842395.

The spelling of 21948492 in words is "twenty-one million, nine hundred forty-eight thousand, four hundred ninety-two".