21385522767 has 8 divisors (see below), whose sum is σ = 32587463296. Its totient is φ = 12220298712.

The previous prime is 21385522747. The next prime is 21385522799. The reversal of 21385522767 is 76722558312.

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

It is not a de Polignac number, because 21385522767 - 2²⁸ = 21117087311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385522747) 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, 509179093 + ... + 509179134.

It is an arithmetic number, because the mean of its divisors is an integer number (4073432912).

Almost surely, 2^21385522767 is an apocalyptic number.

21385522767 is a deficient number, since it is larger than the sum of its proper divisors (11201940529).

21385522767 is a wasteful number, since it uses less digits than its factorization.

21385522767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018358237.

The product of its digits is 1411200, while the sum is 48.

The spelling of 21385522767 in words is "twenty-one billion, three hundred eighty-five million, five hundred twenty-two thousand, seven hundred sixty-seven".