21260317423 has 2 divisors, whose sum is σ = 21260317424. Its totient is φ = 21260317422.

The previous prime is 21260317381. The next prime is 21260317433. The reversal of 21260317423 is 32471306212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21260317423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21260317433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10630158711 + 10630158712.

It is an arithmetic number, because the mean of its divisors is an integer number (10630158712).

Almost surely, 2^21260317423 is an apocalyptic number.

21260317423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21260317423 is an equidigital number, since it uses as much as digits as its factorization.

21260317423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 21260317423 in words is "twenty-one billion, two hundred sixty million, three hundred seventeen thousand, four hundred twenty-three".