23421571637 has 2 divisors, whose sum is σ = 23421571638. Its totient is φ = 23421571636.

The previous prime is 23421571633. The next prime is 23421571717. The reversal of 23421571637 is 73617512432.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23320649521 + 100922116 = 152711^2 + 10046^2 .

It is a cyclic number.

It is not a de Polignac number, because 23421571637 - 2² = 23421571633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23421571594 and 23421571603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23421571633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11710785818 + 11710785819.

It is an arithmetic number, because the mean of its divisors is an integer number (11710785819).

Almost surely, 2^23421571637 is an apocalyptic number.

It is an amenable number.

23421571637 is a deficient number, since it is larger than the sum of its proper divisors (1).

23421571637 is an equidigital number, since it uses as much as digits as its factorization.

23421571637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 41.

The spelling of 23421571637 in words is "twenty-three billion, four hundred twenty-one million, five hundred seventy-one thousand, six hundred thirty-seven".