21262584621 has 8 divisors (see below), whose sum is σ = 28814869024. Its totient is φ = 13942678320.

The previous prime is 21262584611. The next prime is 21262584643. The reversal of 21262584621 is 12648526212.

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

It is not a de Polignac number, because 21262584621 - 2⁶ = 21262584557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21262584621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21262584611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58094311 + ... + 58094676.

It is an arithmetic number, because the mean of its divisors is an integer number (3601858628).

Almost surely, 2^21262584621 is an apocalyptic number.

It is an amenable number.

21262584621 is a deficient number, since it is larger than the sum of its proper divisors (7552284403).

21262584621 is a wasteful number, since it uses less digits than its factorization.

21262584621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116189051.

The product of its digits is 92160, while the sum is 39.

The spelling of 21262584621 in words is "twenty-one billion, two hundred sixty-two million, five hundred eighty-four thousand, six hundred twenty-one".