1221314643222 has 16 divisors (see below), whose sum is σ = 2447728727040. Its totient is φ = 406254974312.

The previous prime is 1221314643221. The next prime is 1221314643233. The reversal of 1221314643222 is 2223464131221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221314643221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212473578 + ... + 212479325.

It is an arithmetic number, because the mean of its divisors is an integer number (152983045440).

Almost surely, 2^{1221314643222} is an apocalyptic number.

1221314643222 is an abundant number, since it is smaller than the sum of its proper divisors (1226414083818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221314643222 is a wasteful number, since it uses less digits than its factorization.

1221314643222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424953387.

The product of its digits is 27648, while the sum is 33.

Adding to 1221314643222 its reverse (2223464131221), we get a palindrome (3444778774443).

The spelling of 1221314643222 in words is "one trillion, two hundred twenty-one billion, three hundred fourteen million, six hundred forty-three thousand, two hundred twenty-two".