1221312331222 has 32 divisors (see below), whose sum is σ = 1958040564480. Its totient is φ = 570296190240.

The previous prime is 1221312331157. The next prime is 1221312331241. The reversal of 1221312331222 is 2221332131221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2120304 + ... + 2634067.

It is an arithmetic number, because the mean of its divisors is an integer number (61188767640).

Almost surely, 2^{1221312331222} is an apocalyptic number.

1221312331222 is a deficient number, since it is larger than the sum of its proper divisors (736728233258).

1221312331222 is a wasteful number, since it uses less digits than its factorization.

1221312331222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4754548.

The product of its digits is 1728, while the sum is 25.

Adding to 1221312331222 its reverse (2221332131221), we get a palindrome (3442644462443).

The spelling of 1221312331222 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred twenty-two".