231001011121 has 4 divisors (see below), whose sum is σ = 231072069744. Its totient is φ = 230929952500.

The previous prime is 231001011097. The next prime is 231001011139. The reversal of 231001011121 is 121110100132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231001011121 - 2¹⁷ = 231000880049 is a prime.

It is a super-2 number, since 2×231001011121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231001011181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35524435 + ... + 35530936.

It is an arithmetic number, because the mean of its divisors is an integer number (57768017436).

Almost surely, 2^231001011121 is an apocalyptic number.

It is an amenable number.

231001011121 is a deficient number, since it is larger than the sum of its proper divisors (71058623).

231001011121 is an equidigital number, since it uses as much as digits as its factorization.

231001011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71058622.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 231001011121 its reverse (121110100132), we get a palindrome (352111111253).

The spelling of 231001011121 in words is "two hundred thirty-one billion, one million, eleven thousand, one hundred twenty-one".