21738192 has 80 divisors (see below), whose sum is σ = 66281472. Its totient is φ = 6007680.

The previous prime is 21738191. The next prime is 21738221. The reversal of 21738192 is 29183712.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21738191) 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, 9373 + ... + 11459.

Almost surely, 2^21738192 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 21738192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33140736).

21738192 is an abundant number, since it is smaller than the sum of its proper divisors (44543280).

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

21738192 is a wasteful number, since it uses less digits than its factorization.

21738192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2130 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 21738192 is about 4662.4234041966. The cubic root of 21738192 is about 279.0879849942.

The spelling of 21738192 in words is "twenty-one million, seven hundred thirty-eight thousand, one hundred ninety-two".