1221221102120 has 16 divisors (see below), whose sum is σ = 2747747479860. Its totient is φ = 488488440832.

The previous prime is 1221221102117. The next prime is 1221221102149. The reversal of 1221221102120 is 212011221221.

It can be written as a sum of positive squares in 2 ways, for example, as 1109091221956 + 112129880164 = 1053134^2 + 334858^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15265263737 + ... + 15265263816.

Almost surely, 2^{1221221102120} is an apocalyptic number.

1221221102120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221221102120 is an abundant number, since it is smaller than the sum of its proper divisors (1526526377740).

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

1221221102120 is a wasteful number, since it uses less digits than its factorization.

1221221102120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30530527564 (or 30530527560 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221221102120 its reverse (212011221221), we get a palindrome (1433232323341).

The spelling of 1221221102120 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty".