1221145045122 has 24 divisors (see below), whose sum is σ = 2444322850704. Its totient is φ = 406709836464.

The previous prime is 1221145045103. The next prime is 1221145045123. The reversal of 1221145045122 is 2215405411221.

It is a super-2 number, since 2×1221145045122² (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 1221145045122.

It is not an unprimeable number, because it can be changed into a prime (1221145045123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8759053 + ... + 8897375.

It is an arithmetic number, because the mean of its divisors is an integer number (101846785446).

Almost surely, 2^{1221145045122} is an apocalyptic number.

1221145045122 is an abundant number, since it is smaller than the sum of its proper divisors (1223177805582).

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

1221145045122 is an equidigital number, since it uses as much as digits as its factorization.

1221145045122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140754 (or 139541 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The spelling of 1221145045122 in words is "one trillion, two hundred twenty-one billion, one hundred forty-five million, forty-five thousand, one hundred twenty-two".