231021121019 has 16 divisors (see below), whose sum is σ = 263446979040. Its totient is φ = 200690757120.

The previous prime is 231021121013. The next prime is 231021121021. The reversal of 231021121019 is 910121120132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231021121019 is a prime.

It is a super-2 number, since 2×231021121019² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231021120985 and 231021121003.

It is not an unprimeable number, because it can be changed into a prime (231021121013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3597212 + ... + 3660870.

It is an arithmetic number, because the mean of its divisors is an integer number (16465436190).

Almost surely, 2^231021121019 is an apocalyptic number.

231021121019 is a deficient number, since it is larger than the sum of its proper divisors (32425858021).

231021121019 is a wasteful number, since it uses less digits than its factorization.

231021121019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80110.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 231021121019 in words is "two hundred thirty-one billion, twenty-one million, one hundred twenty-one thousand, nineteen".