21952537451171 has 2 divisors, whose sum is σ = 21952537451172. Its totient is φ = 21952537451170.

The previous prime is 21952537451087. The next prime is 21952537451177. The reversal of 21952537451171 is 17115473525912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21952537451171 - 2¹⁴ = 21952537434787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21952537451177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10976268725585 + 10976268725586.

It is an arithmetic number, because the mean of its divisors is an integer number (10976268725586).

Almost surely, 2^{21952537451171} is an apocalyptic number.

21952537451171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21952537451171 is an equidigital number, since it uses as much as digits as its factorization.

21952537451171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646000, while the sum is 53.

The spelling of 21952537451171 in words is "twenty-one trillion, nine hundred fifty-two billion, five hundred thirty-seven million, four hundred fifty-one thousand, one hundred seventy-one".