21637343379023 has 2 divisors, whose sum is σ = 21637343379024. Its totient is φ = 21637343379022.

The previous prime is 21637343379013. The next prime is 21637343379059. The reversal of 21637343379023 is 32097334373612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21637343379023 - 2¹⁴ = 21637343362639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21637343379013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10818671689511 + 10818671689512.

It is an arithmetic number, because the mean of its divisors is an integer number (10818671689512).

Almost surely, 2^{21637343379023} is an apocalyptic number.

21637343379023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21637343379023 is an equidigital number, since it uses as much as digits as its factorization.

21637343379023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 53.

The spelling of 21637343379023 in words is "twenty-one trillion, six hundred thirty-seven billion, three hundred forty-three million, three hundred seventy-nine thousand, twenty-three".