1221000331031 has 16 divisors (see below), whose sum is σ = 1333912442688. Its totient is φ = 1110812102400.

The previous prime is 1221000331021. The next prime is 1221000331069. The reversal of 1221000331031 is 1301330001221.

It is not a de Polignac number, because 1221000331031 - 2²² = 1220996136727 is a prime.

It is a super-2 number, since 2×1221000331031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000331021) 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, 2409515 + ... + 2871891.

It is an arithmetic number, because the mean of its divisors is an integer number (83369527668).

Almost surely, 2^{1221000331031} is an apocalyptic number.

1221000331031 is a deficient number, since it is larger than the sum of its proper divisors (112912111657).

1221000331031 is a wasteful number, since it uses less digits than its factorization.

1221000331031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465322.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1221000331031 its reverse (1301330001221), we get a palindrome (2522330332252).

The spelling of 1221000331031 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one thousand, thirty-one".