21079296 has 108 divisors (see below), whose sum is σ = 69512352. Its totient is φ = 6018048.

The previous prime is 21079271. The next prime is 21079297. The reversal of 21079296 is 69297012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21079296.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21079297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15475 + ... + 16781.

Almost surely, 2^21079296 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 21079296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34756176).

21079296 is an abundant number, since it is smaller than the sum of its proper divisors (48433056).

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

21079296 is a wasteful number, since it uses less digits than its factorization.

21079296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21079296 is about 4591.2194458553. The cubic root of 21079296 is about 276.2392380621.

The spelling of 21079296 in words is "twenty-one million, seventy-nine thousand, two hundred ninety-six".