21326232973 has 2 divisors, whose sum is σ = 21326232974. Its totient is φ = 21326232972.

The previous prime is 21326232959. The next prime is 21326233007. The reversal of 21326232973 is 37923262312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18872714884 + 2453518089 = 137378^2 + 49533^2 .

It is a cyclic number.

It is not a de Polignac number, because 21326232973 - 2⁹ = 21326232461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21326232923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663116486 + 10663116487.

It is an arithmetic number, because the mean of its divisors is an integer number (10663116487).

Almost surely, 2^21326232973 is an apocalyptic number.

It is an amenable number.

21326232973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21326232973 is an equidigital number, since it uses as much as digits as its factorization.

21326232973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 40.

The spelling of 21326232973 in words is "twenty-one billion, three hundred twenty-six million, two hundred thirty-two thousand, nine hundred seventy-three".