21912852 has 48 divisors (see below), whose sum is σ = 57968960. Its totient is φ = 6386688.

The previous prime is 21912841. The next prime is 21912853. The reversal of 21912852 is 25821912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21912853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733 + ... + 6660.

Almost surely, 2^21912852 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 21912852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28984480).

21912852 is an abundant number, since it is smaller than the sum of its proper divisors (36056108).

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

21912852 is a wasteful number, since it uses less digits than its factorization.

21912852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7432 (or 7430 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 21912852 is about 4681.1165334779. The cubic root of 21912852 is about 279.8334553803.

The spelling of 21912852 in words is "twenty-one million, nine hundred twelve thousand, eight hundred fifty-two".