21020296 has 32 divisors (see below), whose sum is σ = 45528480. Its totient is φ = 8992000.

The previous prime is 21020281. The next prime is 21020299. The reversal of 21020296 is 69202012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21020299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5530 + ... + 8521.

It is an arithmetic number, because the mean of its divisors is an integer number (1422765).

Almost surely, 2^21020296 is an apocalyptic number.

It is an amenable number.

21020296 is an abundant number, since it is smaller than the sum of its proper divisors (24508184).

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

21020296 is a wasteful number, since it uses less digits than its factorization.

21020296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14085 (or 14081 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21020296 is about 4584.7896353050. The cubic root of 21020296 is about 275.9812701706.

It can be divided in two parts, 21020 and 296, that added together give a square (21316 = 146²).

The spelling of 21020296 in words is "twenty-one million, twenty thousand, two hundred ninety-six".