21329892 has 60 divisors (see below), whose sum is σ = 57094576. Its totient is φ = 6940080.

The previous prime is 21329879. The next prime is 21329899. The reversal of 21329892 is 29892312.

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

It is not an unprimeable number, because it can be changed into a prime (21329899) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13167 + ... + 14697.

Almost surely, 2^21329892 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 21329892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28547288).

21329892 is an abundant number, since it is smaller than the sum of its proper divisors (35764684).

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

21329892 is a wasteful number, since it uses less digits than its factorization.

21329892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1579 counting only the distinct ones).

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

The square root of 21329892 is about 4618.4296032310. The cubic root of 21329892 is about 277.3295958929.

The spelling of 21329892 in words is "twenty-one million, three hundred twenty-nine thousand, eight hundred ninety-two".