1221033042242 has 16 divisors (see below), whose sum is σ = 1975904514360. Its totient is φ = 562563276672.

The previous prime is 1221033042209. The next prime is 1221033042253. The reversal of 1221033042242 is 2422403301221.

It can be written as a sum of positive squares in 4 ways, for example, as 384190468561 + 836842573681 = 619831^2 + 914791^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 41253053 + ... + 41282640.

Almost surely, 2^{1221033042242} is an apocalyptic number.

1221033042242 is a deficient number, since it is larger than the sum of its proper divisors (754871472118).

1221033042242 is a wasteful number, since it uses less digits than its factorization.

1221033042242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82536277.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 1221033042242 its reverse (2422403301221), we get a palindrome (3643436343463).

The spelling of 1221033042242 in words is "one trillion, two hundred twenty-one billion, thirty-three million, forty-two thousand, two hundred forty-two".