23424871621 has 2 divisors, whose sum is σ = 23424871622. Its totient is φ = 23424871620.

The previous prime is 23424871619. The next prime is 23424871633. The reversal of 23424871621 is 12617842432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21498890625 + 1925980996 = 146625^2 + 43886^2 .

It is a cyclic number.

It is not a de Polignac number, because 23424871621 - 2¹ = 23424871619 is a prime.

It is a super-2 number, since 2×23424871621² (a number of 22 digits) contains 22 as substring.

Together with 23424871619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23424871661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11712435810 + 11712435811.

It is an arithmetic number, because the mean of its divisors is an integer number (11712435811).

Almost surely, 2^23424871621 is an apocalyptic number.

It is an amenable number.

23424871621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23424871621 is an equidigital number, since it uses as much as digits as its factorization.

23424871621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The spelling of 23424871621 in words is "twenty-three billion, four hundred twenty-four million, eight hundred seventy-one thousand, six hundred twenty-one".