21765792 has 48 divisors (see below), whose sum is σ = 60147360. Its totient is φ = 6872832.

The previous prime is 21765769. The next prime is 21765839. The reversal of 21765792 is 29756712.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21765792.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4143 + ... + 7790.

It is an arithmetic number, because the mean of its divisors is an integer number (1253070).

Almost surely, 2^21765792 is an apocalyptic number.

It is an amenable number.

21765792 is an abundant number, since it is smaller than the sum of its proper divisors (38381568).

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

21765792 is a wasteful number, since it uses less digits than its factorization.

21765792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11965 (or 11957 counting only the distinct ones).

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

The square root of 21765792 is about 4665.3822994477. The cubic root of 21765792 is about 279.2060501750.

The spelling of 21765792 in words is "twenty-one million, seven hundred sixty-five thousand, seven hundred ninety-two".