1131222131221 has 64 divisors (see below), whose sum is σ = 1455181443072. Its totient is φ = 855360000000.

The previous prime is 1131222131153. The next prime is 1131222131231. The reversal of 1131222131221 is 1221312221311.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131222131221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131222131192 and 1131222131201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131222131231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114248371 + ... + 114258271.

It is an arithmetic number, because the mean of its divisors is an integer number (22737210048).

Almost surely, 2^{1131222131221} is an apocalyptic number.

It is an amenable number.

1131222131221 is a deficient number, since it is larger than the sum of its proper divisors (323959311851).

1131222131221 is a wasteful number, since it uses less digits than its factorization.

1131222131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10454.

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

Adding to 1131222131221 its reverse (1221312221311), we get a palindrome (2352534352532).

The spelling of 1131222131221 in words is "one trillion, one hundred thirty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, two hundred twenty-one".