21412026564 has 12 divisors (see below), whose sum is σ = 49961395344. Its totient is φ = 7137342184.

The previous prime is 21412026539. The next prime is 21412026583. The reversal of 21412026564 is 46562021412.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892167762 + ... + 892167785.

It is an arithmetic number, because the mean of its divisors is an integer number (4163449612).

Almost surely, 2^21412026564 is an apocalyptic number.

It is an amenable number.

21412026564 is an abundant number, since it is smaller than the sum of its proper divisors (28549368780).

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

21412026564 is a wasteful number, since it uses less digits than its factorization.

21412026564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784335554 (or 1784335552 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 21412026564 its reverse (46562021412), we get a palindrome (67974047976).

The spelling of 21412026564 in words is "twenty-one billion, four hundred twelve million, twenty-six thousand, five hundred sixty-four".