1221102220001 has 4 divisors (see below), whose sum is σ = 1292931762372. Its totient is φ = 1149272677632.

The previous prime is 1221102219989. The next prime is 1221102220003. The reversal of 1221102220001 is 1000222011221.

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 602449182976 + 618653037025 = 776176^2 + 786545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221102220001 - 2³⁰ = 1220028478177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221102220003) 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, 35914771160 + ... + 35914771193.

It is an arithmetic number, because the mean of its divisors is an integer number (323232940593).

Almost surely, 2^{1221102220001} is an apocalyptic number.

It is an amenable number.

1221102220001 is a deficient number, since it is larger than the sum of its proper divisors (71829542371).

1221102220001 is an equidigital number, since it uses as much as digits as its factorization.

1221102220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71829542370.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221102220001 its reverse (1000222011221), we get a palindrome (2221324231222).

The spelling of 1221102220001 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty thousand, one".