21243164444613 has 16 divisors (see below), whose sum is σ = 31471892429760. Its totient is φ = 14161867666128.

The previous prime is 21243164444603. The next prime is 21243164444629. The reversal of 21243164444613 is 31644446134212.

21243164444613 is a `hidden beast` number, since 2 + 1 + 2 + 43 + 164 + 4 + 446 + 1 + 3 = 666.

It is not a de Polignac number, because 21243164444613 - 2⁸ = 21243164444357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243164444603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5104570 + ... + 8279067.

It is an arithmetic number, because the mean of its divisors is an integer number (1966993276860).

Almost surely, 2^{21243164444613} is an apocalyptic number.

It is an amenable number.

21243164444613 is a deficient number, since it is larger than the sum of its proper divisors (10228727985147).

21243164444613 is a wasteful number, since it uses less digits than its factorization.

21243164444613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13442433 (or 13442427 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 45.

The spelling of 21243164444613 in words is "twenty-one trillion, two hundred forty-three billion, one hundred sixty-four million, four hundred forty-four thousand, six hundred thirteen".