1221045120441 has 12 divisors (see below), whose sum is σ = 1763841850368. Its totient is φ = 813979306584.

The previous prime is 1221045120439. The next prime is 1221045120539. The reversal of 1221045120441 is 1440215401221.

1221045120441 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 0 + 451 + 204 + 4 + 1 = 666.

It is not a de Polignac number, because 1221045120441 - 2¹ = 1221045120439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221045120431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4078545 + ... + 4367678.

It is an arithmetic number, because the mean of its divisors is an integer number (146986820864).

Almost surely, 2^{1221045120441} is an apocalyptic number.

It is an amenable number.

1221045120441 is a deficient number, since it is larger than the sum of its proper divisors (542796729927).

1221045120441 is a wasteful number, since it uses less digits than its factorization.

1221045120441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8462292 (or 8462289 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The spelling of 1221045120441 in words is "one trillion, two hundred twenty-one billion, forty-five million, one hundred twenty thousand, four hundred forty-one".