1221021122001 has 16 divisors (see below), whose sum is σ = 1713992413440. Its totient is φ = 771045883920.

The previous prime is 1221021121997. The next prime is 1221021122003. The reversal of 1221021122001 is 1002211201221.

It is not a de Polignac number, because 1221021122001 - 2² = 1221021121997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221021122003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386615 + ... + 2089196.

It is an arithmetic number, because the mean of its divisors is an integer number (107124525840).

Almost surely, 2^{1221021122001} is an apocalyptic number.

It is an amenable number.

1221021122001 is a deficient number, since it is larger than the sum of its proper divisors (492971291439).

1221021122001 is a wasteful number, since it uses less digits than its factorization.

1221021122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481996.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221021122001 its reverse (1002211201221), we get a palindrome (2223232323222).

The spelling of 1221021122001 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, one".