1221120012122 has 16 divisors (see below), whose sum is σ = 1866168655200. Its totient is φ = 599102051760.

The previous prime is 1221120012121. The next prime is 1221120012193. The reversal of 1221120012122 is 2212100211221.

It is a super-2 number, since 2×1221120012122² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221120012122.

It is not an unprimeable number, because it can be changed into a prime (1221120012121) 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, 9500372 + ... + 9628047.

It is an arithmetic number, because the mean of its divisors is an integer number (116635540950).

Almost surely, 2^{1221120012122} is an apocalyptic number.

1221120012122 is a deficient number, since it is larger than the sum of its proper divisors (645048643078).

1221120012122 is a wasteful number, since it uses less digits than its factorization.

1221120012122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19129021.

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

Adding to 1221120012122 its reverse (2212100211221), we get a palindrome (3433220223343).

The spelling of 1221120012122 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, twelve thousand, one hundred twenty-two".