1221000110122 has 16 divisors (see below), whose sum is σ = 1983281954472. Its totient is φ = 560425037760.

The previous prime is 1221000110069. The next prime is 1221000110173. The reversal of 1221000110122 is 2210110001221.

It can be written as a sum of positive squares in 4 ways, for example, as 839732144161 + 381267965961 = 916369^2 + 617469^2 .

It is a super-2 number, since 2×1221000110122² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129723313 + ... + 129732724.

Almost surely, 2^{1221000110122} is an apocalyptic number.

1221000110122 is a deficient number, since it is larger than the sum of its proper divisors (762281844350).

1221000110122 is a wasteful number, since it uses less digits than its factorization.

1221000110122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259456233.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221000110122 its reverse (2210110001221), we get a palindrome (3431110111343).

The spelling of 1221000110122 in words is "one trillion, two hundred twenty-one billion, one hundred ten thousand, one hundred twenty-two".