21152206326443 has 4 divisors (see below), whose sum is σ = 21153680670360. Its totient is φ = 21150731982528.

The previous prime is 21152206326413. The next prime is 21152206326451. The reversal of 21152206326443 is 34462360225112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21152206326443 - 2⁸ = 21152206326187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21152206326443.

It is not an unprimeable number, because it can be changed into a prime (21152206326413) 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, 737150438 + ... + 737179131.

It is an arithmetic number, because the mean of its divisors is an integer number (5288420167590).

Almost surely, 2^{21152206326443} is an apocalyptic number.

21152206326443 is a deficient number, since it is larger than the sum of its proper divisors (1474343917).

21152206326443 is a wasteful number, since it uses less digits than its factorization.

21152206326443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474343916.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 21152206326443 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred six million, three hundred twenty-six thousand, four hundred forty-three".