231221100201031 has 2 divisors, whose sum is σ = 231221100201032. Its totient is φ = 231221100201030.

The previous prime is 231221100200977. The next prime is 231221100201041. The reversal of 231221100201031 is 130102001122132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231221100201031 is a prime.

It is a super-2 number, since 2×231221100201031² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231221100201041) 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, 115610550100515 + 115610550100516.

It is an arithmetic number, because the mean of its divisors is an integer number (115610550100516).

Almost surely, 2^{231221100201031} is an apocalyptic number.

231221100201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

231221100201031 is an equidigital number, since it uses as much as digits as its factorization.

231221100201031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 231221100201031 its reverse (130102001122132), we get a palindrome (361323101323163).

The spelling of 231221100201031 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, one hundred million, two hundred one thousand, thirty-one".