21382992 has 60 divisors (see below), whose sum is σ = 60275904. Its totient is φ = 7076160.

The previous prime is 21382981. The next prime is 21383029. The reversal of 21382992 is 29928312.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 23017 + ... + 23927.

Almost surely, 2^21382992 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 21382992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30137952).

21382992 is an abundant number, since it is smaller than the sum of its proper divisors (38892912).

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

21382992 is a wasteful number, since it uses less digits than its factorization.

21382992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088 (or 1079 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21382992 is about 4624.1747371828. The cubic root of 21382992 is about 277.5595392090.

The spelling of 21382992 in words is "twenty-one million, three hundred eighty-two thousand, nine hundred ninety-two".