21692124 has 84 divisors (see below), whose sum is σ = 58576056. Its totient is φ = 7021728.

The previous prime is 21692113. The next prime is 21692137. The reversal of 21692124 is 42129612.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 125302 + ... + 125474.

It is an arithmetic number, because the mean of its divisors is an integer number (697334).

Almost surely, 2^21692124 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 21692124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29288028).

21692124 is an abundant number, since it is smaller than the sum of its proper divisors (36883932).

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

21692124 is a wasteful number, since it uses less digits than its factorization.

21692124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 221 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21692124 is about 4657.4804347415. The cubic root of 21692124 is about 278.8906959972.

The spelling of 21692124 in words is "twenty-one million, six hundred ninety-two thousand, one hundred twenty-four".