23421221393 has 2 divisors, whose sum is σ = 23421221394. Its totient is φ = 23421221392.

The previous prime is 23421221311. The next prime is 23421221431. The reversal of 23421221393 is 39312212432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11738205649 + 11683015744 = 108343^2 + 108088^2 .

It is a cyclic number.

It is not a de Polignac number, because 23421221393 - 2¹⁰ = 23421220369 is a prime.

It is a super-2 number, since 2×23421221393² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23421221303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11710610696 + 11710610697.

It is an arithmetic number, because the mean of its divisors is an integer number (11710610697).

Almost surely, 2^23421221393 is an apocalyptic number.

It is an amenable number.

23421221393 is a deficient number, since it is larger than the sum of its proper divisors (1).

23421221393 is an equidigital number, since it uses as much as digits as its factorization.

23421221393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The spelling of 23421221393 in words is "twenty-three billion, four hundred twenty-one million, two hundred twenty-one thousand, three hundred ninety-three".