21164763 has 8 divisors (see below), whose sum is σ = 28269648. Its totient is φ = 14084864.

The previous prime is 21164713. The next prime is 21164771. The reversal of 21164763 is 36746112.

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

It is a cyclic number.

It is not a de Polignac number, because 21164763 - 2²¹ = 19067611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21164763.

It is not an unprimeable number, because it can be changed into a prime (21164713) 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, 4170 + ... + 7727.

It is an arithmetic number, because the mean of its divisors is an integer number (3533706).

Almost surely, 2^21164763 is an apocalyptic number.

21164763 is a deficient number, since it is larger than the sum of its proper divisors (7104885).

21164763 is a wasteful number, since it uses less digits than its factorization.

21164763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12493.

The product of its digits is 6048, while the sum is 30.

The square root of 21164763 is about 4600.5176882607. The cubic root of 21164763 is about 276.6120762923.

The spelling of 21164763 in words is "twenty-one million, one hundred sixty-four thousand, seven hundred sixty-three".