20123211697 has 2 divisors, whose sum is σ = 20123211698. Its totient is φ = 20123211696.

The previous prime is 20123211677. The next prime is 20123211749. The reversal of 20123211697 is 79611232102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18561065121 + 1562146576 = 136239^2 + 39524^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123211697 - 2²³ = 20114823089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123211607) 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, 10061605848 + 10061605849.

It is an arithmetic number, because the mean of its divisors is an integer number (10061605849).

Almost surely, 2^20123211697 is an apocalyptic number.

It is an amenable number.

20123211697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123211697 is an equidigital number, since it uses as much as digits as its factorization.

20123211697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

Adding to 20123211697 its reverse (79611232102), we get a palindrome (99734443799).

The spelling of 20123211697 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, six hundred ninety-seven".