23440001621431 has 2 divisors, whose sum is σ = 23440001621432. Its totient is φ = 23440001621430.

The previous prime is 23440001621419. The next prime is 23440001621459. The reversal of 23440001621431 is 13412610004432.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23440001621431 - 2¹⁷ = 23440001490359 is a prime.

It is a super-2 number, since 2×23440001621431² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23440001621393 and 23440001621402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23440001621731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11720000810715 + 11720000810716.

It is an arithmetic number, because the mean of its divisors is an integer number (11720000810716).

Almost surely, 2^{23440001621431} is an apocalyptic number.

23440001621431 is a deficient number, since it is larger than the sum of its proper divisors (1).

23440001621431 is an equidigital number, since it uses as much as digits as its factorization.

23440001621431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 23440001621431 its reverse (13412610004432), we get a palindrome (36852611625863).

The spelling of 23440001621431 in words is "twenty-three trillion, four hundred forty billion, one million, six hundred twenty-one thousand, four hundred thirty-one".