20400222431213 has 4 divisors (see below), whose sum is σ = 21600235515420. Its totient is φ = 19200209347008.

The previous prime is 20400222431207. The next prime is 20400222431221. The reversal of 20400222431213 is 31213422200402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14678070452809 + 5722151978404 = 3831197^2 + 2392102^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400222431213 - 2¹⁸ = 20400222169069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400222431263) 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 in 3 ways as a sum of consecutive naturals, for example, 600006542078 + ... + 600006542111.

It is an arithmetic number, because the mean of its divisors is an integer number (5400058878855).

Almost surely, 2^{20400222431213} is an apocalyptic number.

It is an amenable number.

20400222431213 is a deficient number, since it is larger than the sum of its proper divisors (1200013084207).

20400222431213 is a wasteful number, since it uses less digits than its factorization.

20400222431213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200013084206.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20400222431213 its reverse (31213422200402), we get a palindrome (51613644631615).

The spelling of 20400222431213 in words is "twenty trillion, four hundred billion, two hundred twenty-two million, four hundred thirty-one thousand, two hundred thirteen".