21623245753397 has 2 divisors, whose sum is σ = 21623245753398. Its totient is φ = 21623245753396.

The previous prime is 21623245753327. The next prime is 21623245753423. The reversal of 21623245753397 is 79335754232612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20211507309841 + 1411738443556 = 4495721^2 + 1188166^2 .

It is a cyclic number.

It is not a de Polignac number, because 21623245753397 - 2⁸ = 21623245753141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21623245753327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811622876698 + 10811622876699.

It is an arithmetic number, because the mean of its divisors is an integer number (10811622876699).

Almost surely, 2^{21623245753397} is an apocalyptic number.

It is an amenable number.

21623245753397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21623245753397 is an equidigital number, since it uses as much as digits as its factorization.

21623245753397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57153600, while the sum is 59.

The spelling of 21623245753397 in words is "twenty-one trillion, six hundred twenty-three billion, two hundred forty-five million, seven hundred fifty-three thousand, three hundred ninety-seven".