231101021131 has 2 divisors, whose sum is σ = 231101021132. Its totient is φ = 231101021130.

The previous prime is 231101021117. The next prime is 231101021147. The reversal of 231101021131 is 131120101132.

It is a happy number.

It is an a-pointer prime, because the next prime (231101021147) can be obtained adding 231101021131 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231101021131 - 2³⁵ = 196741282763 is a prime.

It is a super-2 number, since 2×231101021131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231101021101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115550510565 + 115550510566.

It is an arithmetic number, because the mean of its divisors is an integer number (115550510566).

Almost surely, 2^231101021131 is an apocalyptic number.

231101021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

231101021131 is an equidigital number, since it uses as much as digits as its factorization.

231101021131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 231101021131 its reverse (131120101132), we get a palindrome (362221122263).

The spelling of 231101021131 in words is "two hundred thirty-one billion, one hundred one million, twenty-one thousand, one hundred thirty-one".