23121716447 has 2 divisors, whose sum is σ = 23121716448. Its totient is φ = 23121716446.

The previous prime is 23121716407. The next prime is 23121716459. The reversal of 23121716447 is 74461712132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121716447 - 2¹⁸ = 23121454303 is a prime.

It is a super-2 number, since 2×23121716447² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23121716447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121716407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560858223 + 11560858224.

It is an arithmetic number, because the mean of its divisors is an integer number (11560858224).

Almost surely, 2^23121716447 is an apocalyptic number.

23121716447 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121716447 is an equidigital number, since it uses as much as digits as its factorization.

23121716447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The spelling of 23121716447 in words is "twenty-three billion, one hundred twenty-one million, seven hundred sixteen thousand, four hundred forty-seven".