1221133221031 has 16 divisors (see below), whose sum is σ = 1306719770688. Its totient is φ = 1137091648000.

The previous prime is 1221133221029. The next prime is 1221133221047. The reversal of 1221133221031 is 1301223311221.

It is not a de Polignac number, because 1221133221031 - 2¹ = 1221133221029 is a prime.

It is a super-2 number, since 2×1221133221031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221133220993 and 1221133221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221133221071) 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, 2098446 + ... + 2616436.

It is an arithmetic number, because the mean of its divisors is an integer number (81669985668).

Almost surely, 2^{1221133221031} is an apocalyptic number.

1221133221031 is a deficient number, since it is larger than the sum of its proper divisors (85586549657).

1221133221031 is a wasteful number, since it uses less digits than its factorization.

1221133221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519482.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1221133221031 its reverse (1301223311221), we get a palindrome (2522356532252).

The spelling of 1221133221031 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, thirty-one".