21369792 has 28 divisors (see below), whose sum is σ = 56541416. Its totient is φ = 7123200.

The previous prime is 21369773. The next prime is 21369797. The reversal of 21369792 is 29796312.

It is a self number, because there is not a number n which added to its sum of digits gives 21369792.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369797) 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, 55459 + ... + 55842.

Almost surely, 2^21369792 is an apocalyptic number.

It is an amenable number.

21369792 is an abundant number, since it is smaller than the sum of its proper divisors (35171624).

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

21369792 is a wasteful number, since it uses less digits than its factorization.

21369792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111316 (or 111306 counting only the distinct ones).

The product of its digits is 40824, while the sum is 39.

The square root of 21369792 is about 4622.7472351406. The cubic root of 21369792 is about 277.5024137441.

The spelling of 21369792 in words is "twenty-one million, three hundred sixty-nine thousand, seven hundred ninety-two".