21612192 has 96 divisors (see below), whose sum is σ = 67132800. Its totient is φ = 5956608.

The previous prime is 21612191. The next prime is 21612211. The reversal of 21612192 is 29121612.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21612191) 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, 18934 + ... + 20042.

It is an arithmetic number, because the mean of its divisors is an integer number (699300).

Almost surely, 2^21612192 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 21612192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33566400).

21612192 is an abundant number, since it is smaller than the sum of its proper divisors (45520608).

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

21612192 is a wasteful number, since it uses less digits than its factorization.

21612192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1150 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

The square root of 21612192 is about 4648.8914807726. The cubic root of 21612192 is about 278.5477185418.

The spelling of 21612192 in words is "twenty-one million, six hundred twelve thousand, one hundred ninety-two".