21342192 has 80 divisors (see below), whose sum is σ = 57844512. Its totient is φ = 6773760.

The previous prime is 21342179. The next prime is 21342193. The reversal of 21342192 is 29124312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108238 + ... + 108434.

Almost surely, 2^21342192 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 21342192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28922256).

21342192 is an abundant number, since it is smaller than the sum of its proper divisors (36502320).

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

21342192 is a wasteful number, since it uses less digits than its factorization.

21342192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 300 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21342192 is about 4619.7610327808. The cubic root of 21342192 is about 277.3828935303.

The spelling of 21342192 in words is "twenty-one million, three hundred forty-two thousand, one hundred ninety-two".