21816462631373 has 2 divisors, whose sum is σ = 21816462631374. Its totient is φ = 21816462631372.

The previous prime is 21816462631367. The next prime is 21816462631459. The reversal of 21816462631373 is 37313626461812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16257491715364 + 5558970916009 = 4032058^2 + 2357747^2 .

It is a cyclic number.

It is not a de Polignac number, because 21816462631373 - 2⁶ = 21816462631309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21816462661373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10908231315686 + 10908231315687.

It is an arithmetic number, because the mean of its divisors is an integer number (10908231315687).

Almost surely, 2^{21816462631373} is an apocalyptic number.

It is an amenable number.

21816462631373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21816462631373 is an equidigital number, since it uses as much as digits as its factorization.

21816462631373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 53.

The spelling of 21816462631373 in words is "twenty-one trillion, eight hundred sixteen billion, four hundred sixty-two million, six hundred thirty-one thousand, three hundred seventy-three".