20123211733613 has 2 divisors, whose sum is σ = 20123211733614. Its totient is φ = 20123211733612.

The previous prime is 20123211733489. The next prime is 20123211733619. The reversal of 20123211733613 is 31633711232102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17944390710724 + 2178821022889 = 4236082^2 + 1476083^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123211733613 - 2²⁶ = 20123144624749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123211733619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061605866806 + 10061605866807.

It is an arithmetic number, because the mean of its divisors is an integer number (10061605866807).

Almost surely, 2^{20123211733613} is an apocalyptic number.

It is an amenable number.

20123211733613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123211733613 is an equidigital number, since it uses as much as digits as its factorization.

20123211733613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

Adding to 20123211733613 its reverse (31633711232102), we get a palindrome (51756922965715).

The spelling of 20123211733613 in words is "twenty trillion, one hundred twenty-three billion, two hundred eleven million, seven hundred thirty-three thousand, six hundred thirteen".