21068892 has 54 divisors (see below), whose sum is σ = 57685992. Its totient is φ = 6480864.

The previous prime is 21068869. The next prime is 21068893. The reversal of 21068892 is 29886012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068893) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4353 + ... + 7815.

Almost surely, 2^21068892 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 21068892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28842996).

21068892 is an abundant number, since it is smaller than the sum of its proper divisors (36617100).

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

21068892 is a wasteful number, since it uses less digits than its factorization.

21068892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499 (or 3481 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21068892 is about 4590.0862736990. The cubic root of 21068892 is about 276.1937832550.

The spelling of 21068892 in words is "twenty-one million, sixty-eight thousand, eight hundred ninety-two".