21079392 has 24 divisors (see below), whose sum is σ = 55333656. Its totient is φ = 7026432.

The previous prime is 21079391. The next prime is 21079393. The reversal of 21079392 is 29397012.

It is an interprime number because it is at equal distance from previous prime (21079391) and next prime (21079393).

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21079391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109693 + ... + 109884.

It is an arithmetic number, because the mean of its divisors is an integer number (2305569).

Almost surely, 2^21079392 is an apocalyptic number.

It is an amenable number.

21079392 is an abundant number, since it is smaller than the sum of its proper divisors (34254264).

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

21079392 is a wasteful number, since it uses less digits than its factorization.

21079392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219590 (or 219582 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 21079392 is about 4591.2299005822. The cubic root of 21079392 is about 276.2396574140.

The spelling of 21079392 in words is "twenty-one million, seventy-nine thousand, three hundred ninety-two".