20213231311249 has 2 divisors, whose sum is σ = 20213231311250. Its totient is φ = 20213231311248.

The previous prime is 20213231311199. The next prime is 20213231311253. The reversal of 20213231311249 is 94211313231202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14088522027024 + 6124709284225 = 3753468^2 + 2474815^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213231311249 - 2⁷ = 20213231311121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20213231311549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106615655624 + 10106615655625.

It is an arithmetic number, because the mean of its divisors is an integer number (10106615655625).

Almost surely, 2^{20213231311249} is an apocalyptic number.

It is an amenable number.

20213231311249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213231311249 is an equidigital number, since it uses as much as digits as its factorization.

20213231311249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 20213231311249 in words is "twenty trillion, two hundred thirteen billion, two hundred thirty-one million, three hundred eleven thousand, two hundred forty-nine".