21792765 has 8 divisors (see below), whose sum is σ = 34868448. Its totient is φ = 11622800.

The previous prime is 21792761. The next prime is 21792769. The reversal of 21792765 is 56729712.

It is an interprime number because it is at equal distance from previous prime (21792761) and next prime (21792769).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21792765 - 2² = 21792761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792761) 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, 726411 + ... + 726440.

It is an arithmetic number, because the mean of its divisors is an integer number (4358556).

Almost surely, 2^21792765 is an apocalyptic number.

It is an amenable number.

21792765 is a deficient number, since it is larger than the sum of its proper divisors (13075683).

21792765 is a wasteful number, since it uses less digits than its factorization.

21792765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452859.

The product of its digits is 52920, while the sum is 39.

The square root of 21792765 is about 4668.2721643023. The cubic root of 21792765 is about 279.3213368294.

The spelling of 21792765 in words is "twenty-one million, seven hundred ninety-two thousand, seven hundred sixty-five".