1221201220022 has 12 divisors (see below), whose sum is σ = 2130871516740. Its totient is φ = 523371951396.

The previous prime is 1221201219947. The next prime is 1221201220061. The reversal of 1221201220022 is 2200221021221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6230618372 + ... + 6230618567.

It is an arithmetic number, because the mean of its divisors is an integer number (177572626395).

Almost surely, 2^{1221201220022} is an apocalyptic number.

1221201220022 is a deficient number, since it is larger than the sum of its proper divisors (909670296718).

1221201220022 is a wasteful number, since it uses less digits than its factorization.

1221201220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12461236955 (or 12461236948 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221201220022 its reverse (2200221021221), we get a palindrome (3421422241243).

The spelling of 1221201220022 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred twenty thousand, twenty-two".