1221442445331 has 6 divisors (see below), whose sum is σ = 1764305754380. Its totient is φ = 814294963548.

The previous prime is 1221442445323. The next prime is 1221442445357. The reversal of 1221442445331 is 1335442441221.

1221442445331 is a `hidden beast` number, since 1 + 221 + 4 + 424 + 4 + 5 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 1221442445331 - 2³ = 1221442445323 is a prime.

It is a super-2 number, since 2×1221442445331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221442445381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67857913621 + ... + 67857913638.

Almost surely, 2^{1221442445331} is an apocalyptic number.

1221442445331 is a deficient number, since it is larger than the sum of its proper divisors (542863309049).

1221442445331 is a wasteful number, since it uses less digits than its factorization.

1221442445331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135715827265 (or 135715827262 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

Adding to 1221442445331 its reverse (1335442441221), we get a palindrome (2556884886552).

The spelling of 1221442445331 in words is "one trillion, two hundred twenty-one billion, four hundred forty-two million, four hundred forty-five thousand, three hundred thirty-one".