1221033042241 has 4 divisors (see below), whose sum is σ = 1292858515332. Its totient is φ = 1149207569152.

The previous prime is 1221033042209. The next prime is 1221033042253. The reversal of 1221033042241 is 1422403301221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 599805329841 + 621227712400 = 774471^2 + 788180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221033042241 - 2⁵ = 1221033042209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221033042041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35912736520 + ... + 35912736553.

It is an arithmetic number, because the mean of its divisors is an integer number (323214628833).

Almost surely, 2^{1221033042241} is an apocalyptic number.

It is an amenable number.

1221033042241 is a deficient number, since it is larger than the sum of its proper divisors (71825473091).

1221033042241 is an equidigital number, since it uses as much as digits as its factorization.

1221033042241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71825473090.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1221033042241 its reverse (1422403301221), we get a palindrome (2643436343462).

The spelling of 1221033042241 in words is "one trillion, two hundred twenty-one billion, thirty-three million, forty-two thousand, two hundred forty-one".