23420517251 has 2 divisors, whose sum is σ = 23420517252. Its totient is φ = 23420517250.

The previous prime is 23420517227. The next prime is 23420517269. The reversal of 23420517251 is 15271502432.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23420517251 - 2¹⁰ = 23420516227 is a prime.

It is not a weakly prime, because it can be changed into another prime (23420517271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11710258625 + 11710258626.

It is an arithmetic number, because the mean of its divisors is an integer number (11710258626).

Almost surely, 2^23420517251 is an apocalyptic number.

23420517251 is a deficient number, since it is larger than the sum of its proper divisors (1).

23420517251 is an equidigital number, since it uses as much as digits as its factorization.

23420517251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 23420517251 in words is "twenty-three billion, four hundred twenty million, five hundred seventeen thousand, two hundred fifty-one".