21912192 has 96 divisors (see below), whose sum is σ = 65875680. Its totient is φ = 6978048.

The previous prime is 21912181. The next prime is 21912193. The reversal of 21912192 is 29121912.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (21912193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26083 + ... + 26909.

It is an arithmetic number, because the mean of its divisors is an integer number (686205).

Almost surely, 2^21912192 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 21912192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32937840).

21912192 is an abundant number, since it is smaller than the sum of its proper divisors (43963488).

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

21912192 is a wasteful number, since it uses less digits than its factorization.

21912192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 855 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 21912192 is about 4681.0460369452. The cubic root of 21912192 is about 279.8306458885.

The spelling of 21912192 in words is "twenty-one million, nine hundred twelve thousand, one hundred ninety-two".