20113123397 has 2 divisors, whose sum is σ = 20113123398. Its totient is φ = 20113123396.

The previous prime is 20113123369. The next prime is 20113123403. The reversal of 20113123397 is 79332131102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17678095681 + 2435027716 = 132959^2 + 49346^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113123397 - 2¹⁰ = 20113122373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20113123097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056561698 + 10056561699.

It is an arithmetic number, because the mean of its divisors is an integer number (10056561699).

Almost surely, 2^20113123397 is an apocalyptic number.

It is an amenable number.

20113123397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113123397 is an equidigital number, since it uses as much as digits as its factorization.

20113123397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

Adding to 20113123397 its reverse (79332131102), we get a palindrome (99445254499).

The spelling of 20113123397 in words is "twenty billion, one hundred thirteen million, one hundred twenty-three thousand, three hundred ninety-seven".