1221222101001 has 32 divisors (see below), whose sum is σ = 1946144102400. Its totient is φ = 666013522944.

The previous prime is 1221222100981. The next prime is 1221222101017. The reversal of 1221222101001 is 1001012221221.

It is not a de Polignac number, because 1221222101001 - 2¹⁴ = 1221222084617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221222101041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2598735 + ... + 3032468.

It is an arithmetic number, because the mean of its divisors is an integer number (60817003200).

Almost surely, 2^{1221222101001} is an apocalyptic number.

It is an amenable number.

1221222101001 is a deficient number, since it is larger than the sum of its proper divisors (724922001399).

1221222101001 is a wasteful number, since it uses less digits than its factorization.

1221222101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5631685.

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

Adding to 1221222101001 its reverse (1001012221221), we get a palindrome (2222234322222).

The spelling of 1221222101001 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred one thousand, one".