21465426656 has 12 divisors (see below), whose sum is σ = 42260058792. Its totient is φ = 10732713312.

The previous prime is 21465426629. The next prime is 21465426659. The reversal of 21465426656 is 65662456412.

It is a self number, because there is not a number n which added to its sum of digits gives 21465426656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465426659) 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 as a sum of consecutive naturals, namely, 335397260 + ... + 335397323.

It is an arithmetic number, because the mean of its divisors is an integer number (3521671566).

Almost surely, 2^21465426656 is an apocalyptic number.

It is an amenable number.

21465426656 is a deficient number, since it is larger than the sum of its proper divisors (20794632136).

21465426656 is an equidigital number, since it uses as much as digits as its factorization.

21465426656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670794593 (or 670794585 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 47.

The spelling of 21465426656 in words is "twenty-one billion, four hundred sixty-five million, four hundred twenty-six thousand, six hundred fifty-six".