21626534543213 has 4 divisors (see below), whose sum is σ = 21626565933888. Its totient is φ = 21626503152540.

The previous prime is 21626534543191. The next prime is 21626534543221. The reversal of 21626534543213 is 31234543562612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21626534543213 - 2¹² = 21626534539117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626534543233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14638181 + ... + 16047722.

It is an arithmetic number, because the mean of its divisors is an integer number (5406641483472).

Almost surely, 2^{21626534543213} is an apocalyptic number.

It is an amenable number.

21626534543213 is a deficient number, since it is larger than the sum of its proper divisors (31390675).

21626534543213 is an equidigital number, since it uses as much as digits as its factorization.

21626534543213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31390674.

The product of its digits is 3110400, while the sum is 47.

The spelling of 21626534543213 in words is "twenty-one trillion, six hundred twenty-six billion, five hundred thirty-four million, five hundred forty-three thousand, two hundred thirteen".