21364622646 has 8 divisors (see below), whose sum is σ = 42729245304. Its totient is φ = 7121540880.

The previous prime is 21364622603. The next prime is 21364622647. The reversal of 21364622646 is 64622646312.

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

21364622646 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21364622598 and 21364622607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364622647) 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 3 ways as a sum of consecutive naturals, for example, 1780385215 + ... + 1780385226.

It is an arithmetic number, because the mean of its divisors is an integer number (5341155663).

Almost surely, 2^21364622646 is an apocalyptic number.

21364622646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21364622646 is a wasteful number, since it uses less digits than its factorization.

21364622646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3560770446.

The product of its digits is 497664, while the sum is 42.

The spelling of 21364622646 in words is "twenty-one billion, three hundred sixty-four million, six hundred twenty-two thousand, six hundred forty-six".