1231222020013 has 2 divisors, whose sum is σ = 1231222020014. Its totient is φ = 1231222020012.

The previous prime is 1231222019999. The next prime is 1231222020023. The reversal of 1231222020013 is 3100202221321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636160974409 + 595061045604 = 797597^2 + 771402^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231222020013 - 2²⁵ = 1231188465581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231222020023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615611010006 + 615611010007.

It is an arithmetic number, because the mean of its divisors is an integer number (615611010007).

Almost surely, 2^{1231222020013} is an apocalyptic number.

It is an amenable number.

1231222020013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231222020013 is an equidigital number, since it uses as much as digits as its factorization.

1231222020013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1231222020013 its reverse (3100202221321), we get a palindrome (4331424241334).

The spelling of 1231222020013 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-two million, twenty thousand, thirteen".