231002121 has 24 divisors (see below), whose sum is σ = 363351744. Its totient is φ = 130136160.

The previous prime is 231002113. The next prime is 231002153. The reversal of 231002121 is 121200132.

It is not a de Polignac number, because 231002121 - 2³ = 231002113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231002097 and 231002106.

It is not an unprimeable number, because it can be changed into a prime (231002221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 630 + ... + 21503.

It is an arithmetic number, because the mean of its divisors is an integer number (15139656).

Almost surely, 2^231002121 is an apocalyptic number.

231002121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231002121 is a deficient number, since it is larger than the sum of its proper divisors (132349623).

231002121 is a wasteful number, since it uses less digits than its factorization.

231002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22221 (or 22214 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 231002121 is about 15198.7539291877. The cubic root of 231002121 is about 613.5811218848.

Adding to 231002121 its reverse (121200132), we get a palindrome (352202253).

The spelling of 231002121 in words is "two hundred thirty-one million, two thousand, one hundred twenty-one".