31231200121223 has 2 divisors, whose sum is σ = 31231200121224. Its totient is φ = 31231200121222.

The previous prime is 31231200121207. The next prime is 31231200121259. The reversal of 31231200121223 is 32212100213213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31231200121223 - 2⁴ = 31231200121207 is a prime.

It is a super-2 number, since 2×31231200121223² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231200123223) 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, 15615600060611 + 15615600060612.

It is an arithmetic number, because the mean of its divisors is an integer number (15615600060612).

Almost surely, 2^{31231200121223} is an apocalyptic number.

31231200121223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231200121223 is an equidigital number, since it uses as much as digits as its factorization.

31231200121223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31231200121223 its reverse (32212100213213), we get a palindrome (63443300334436).

The spelling of 31231200121223 in words is "thirty-one trillion, two hundred thirty-one billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-three".