23197434521 has 2 divisors, whose sum is σ = 23197434522. Its totient is φ = 23197434520.

The previous prime is 23197434511. The next prime is 23197434607. The reversal of 23197434521 is 12543479132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20410122496 + 2787312025 = 142864^2 + 52795^2 .

It is a cyclic number.

It is not a de Polignac number, because 23197434521 - 2¹⁴ = 23197418137 is a prime.

It is not a weakly prime, because it can be changed into another prime (23197434511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11598717260 + 11598717261.

It is an arithmetic number, because the mean of its divisors is an integer number (11598717261).

Almost surely, 2^23197434521 is an apocalyptic number.

It is an amenable number.

23197434521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23197434521 is an equidigital number, since it uses as much as digits as its factorization.

23197434521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The spelling of 23197434521 in words is "twenty-three billion, one hundred ninety-seven million, four hundred thirty-four thousand, five hundred twenty-one".