23574647821 has 2 divisors, whose sum is σ = 23574647822. Its totient is φ = 23574647820.

The previous prime is 23574647819. The next prime is 23574647843. The reversal of 23574647821 is 12874647532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18636072196 + 4938575625 = 136514^2 + 70275^2 .

It is a cyclic number.

It is not a de Polignac number, because 23574647821 - 2¹ = 23574647819 is a prime.

Together with 23574647819, 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 (23574642821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11787323910 + 11787323911.

It is an arithmetic number, because the mean of its divisors is an integer number (11787323911).

Almost surely, 2^23574647821 is an apocalyptic number.

It is an amenable number.

23574647821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23574647821 is an equidigital number, since it uses as much as digits as its factorization.

23574647821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 49.

The spelling of 23574647821 in words is "twenty-three billion, five hundred seventy-four million, six hundred forty-seven thousand, eight hundred twenty-one".