1221122200031 has 4 divisors (see below), whose sum is σ = 1221128387064. Its totient is φ = 1221116013000.

The previous prime is 1221122200021. The next prime is 1221122200079. The reversal of 1221122200031 is 1300022211221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221122200031 - 2³⁸ = 946244293087 is a prime.

It is a super-2 number, since 2×1221122200031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221122199982 and 1221122200009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122200021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2787365 + ... + 3195566.

It is an arithmetic number, because the mean of its divisors is an integer number (305282096766).

Almost surely, 2^{1221122200031} is an apocalyptic number.

1221122200031 is a deficient number, since it is larger than the sum of its proper divisors (6187033).

1221122200031 is an equidigital number, since it uses as much as digits as its factorization.

1221122200031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6187032.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221122200031 its reverse (1300022211221), we get a palindrome (2521144411252).

The spelling of 1221122200031 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred thousand, thirty-one".