21948924 has 24 divisors (see below), whose sum is σ = 51307648. Its totient is φ = 7302960.

The previous prime is 21948893. The next prime is 21948929. The reversal of 21948924 is 42984912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948929) 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, 6969 + ... + 9615.

Almost surely, 2^21948924 is an apocalyptic number.

It is an amenable number.

21948924 is an abundant number, since it is smaller than the sum of its proper divisors (29358724).

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

21948924 is a wasteful number, since it uses less digits than its factorization.

21948924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345 (or 3343 counting only the distinct ones).

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

The square root of 21948924 is about 4684.9678760905. The cubic root of 21948924 is about 279.9869211578.

The spelling of 21948924 in words is "twenty-one million, nine hundred forty-eight thousand, nine hundred twenty-four".