21948912 has 30 divisors (see below), whose sum is σ = 61426872. Its totient is φ = 7316256.

The previous prime is 21948893. The next prime is 21948929. The reversal of 21948912 is 21984912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76068 + ... + 76355.

Almost surely, 2^21948912 is an apocalyptic number.

It is an amenable number.

21948912 is an abundant number, since it is smaller than the sum of its proper divisors (39477960).

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

21948912 is a wasteful number, since it uses less digits than its factorization.

21948912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152437 (or 152428 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21948912 is about 4684.9665953985. The cubic root of 21948912 is about 279.9868701326.

The spelling of 21948912 in words is "twenty-one million, nine hundred forty-eight thousand, nine hundred twelve".