21164864963 has 8 divisors (see below), whose sum is σ = 23092639680. Its totient is φ = 19237706280.

The previous prime is 21164864953. The next prime is 21164864989. The reversal of 21164864963 is 36946846112.

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 21164864963 - 2⁴ = 21164864947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21164864933) 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, 80645 + ... + 220982.

It is an arithmetic number, because the mean of its divisors is an integer number (2886579960).

Almost surely, 2^21164864963 is an apocalyptic number.

21164864963 is a deficient number, since it is larger than the sum of its proper divisors (1927774717).

21164864963 is a wasteful number, since it uses less digits than its factorization.

21164864963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308017.

The product of its digits is 1492992, while the sum is 50.

The spelling of 21164864963 in words is "twenty-one billion, one hundred sixty-four million, eight hundred sixty-four thousand, nine hundred sixty-three".