1221040045001 has 4 divisors (see below), whose sum is σ = 1395474337152. Its totient is φ = 1046605752852.

The previous prime is 1221040044943. The next prime is 1221040045009. The reversal of 1221040045001 is 1005400401221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221040045001 - 2³⁰ = 1219966303177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221040045009) 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, 87217146065 + ... + 87217146078.

It is an arithmetic number, because the mean of its divisors is an integer number (348868584288).

Almost surely, 2^{1221040045001} is an apocalyptic number.

It is an amenable number.

1221040045001 is a deficient number, since it is larger than the sum of its proper divisors (174434292151).

1221040045001 is an equidigital number, since it uses as much as digits as its factorization.

1221040045001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174434292150.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 1221040045001 its reverse (1005400401221), we get a palindrome (2226440446222).

The spelling of 1221040045001 in words is "one trillion, two hundred twenty-one billion, forty million, forty-five thousand, one".