23812021993 has 2 divisors, whose sum is σ = 23812021994. Its totient is φ = 23812021992.

The previous prime is 23812021967. The next prime is 23812022021. The reversal of 23812021993 is 39912021832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18298513984 + 5513508009 = 135272^2 + 74253^2 .

It is a cyclic number.

It is not a de Polignac number, because 23812021993 - 2¹³ = 23812013801 is a prime.

It is not a weakly prime, because it can be changed into another prime (23812021903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11906010996 + 11906010997.

It is an arithmetic number, because the mean of its divisors is an integer number (11906010997).

Almost surely, 2^23812021993 is an apocalyptic number.

It is an amenable number.

23812021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

23812021993 is an equidigital number, since it uses as much as digits as its factorization.

23812021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

It can be divided in two parts, 23 and 812021993, that added together give a square (812022016 = 28496²).

The spelling of 23812021993 in words is "twenty-three billion, eight hundred twelve million, twenty-one thousand, nine hundred ninety-three".