1231212121321 has 16 divisors (see below), whose sum is σ = 1516641081984. Its totient is φ = 973308155904.

The previous prime is 1231212121313. The next prime is 1231212121357.

It is a happy number.

1231212121321 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1231212121321 - 2³ = 1231212121313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231212121292 and 1231212121301.

It is not an unprimeable number, because it can be changed into a prime (1231212121421) 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, 5710936 + ... + 5922601.

It is an arithmetic number, because the mean of its divisors is an integer number (94790067624).

Almost surely, 2^{1231212121321} is an apocalyptic number.

It is an amenable number.

1231212121321 is a deficient number, since it is larger than the sum of its proper divisors (285428960663).

1231212121321 is a wasteful number, since it uses less digits than its factorization.

1231212121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11634720.

The product of its digits is 288, while the sum is 22.

The spelling of 1231212121321 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".