21372096 has 56 divisors (see below), whose sum is σ = 56987440. Its totient is φ = 7068672.

The previous prime is 21372089. The next prime is 21372103. The reversal of 21372096 is 69027312.

It is an interprime number because it is at equal distance from previous prime (21372089) and next prime (21372103).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29790 + ... + 30498.

Almost surely, 2^21372096 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 21372096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28493720).

21372096 is an abundant number, since it is smaller than the sum of its proper divisors (35615344).

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

21372096 is a wasteful number, since it uses less digits than its factorization.

21372096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21372096 is about 4622.9964308877. The cubic root of 21372096 is about 277.5123864287.

The spelling of 21372096 in words is "twenty-one million, three hundred seventy-two thousand, ninety-six".