21369071456 has 12 divisors (see below), whose sum is σ = 42070359492. Its totient is φ = 10684535712.

The previous prime is 21369071441. The next prime is 21369071483. The reversal of 21369071456 is 65417096312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333891710 + ... + 333891773.

It is an arithmetic number, because the mean of its divisors is an integer number (3505863291).

Almost surely, 2^21369071456 is an apocalyptic number.

It is an amenable number.

21369071456 is a deficient number, since it is larger than the sum of its proper divisors (20701288036).

21369071456 is an equidigital number, since it uses as much as digits as its factorization.

21369071456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667783493 (or 667783485 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 21369071456 in words is "twenty-one billion, three hundred sixty-nine million, seventy-one thousand, four hundred fifty-six".