1220221020001 has 4 divisors (see below), whose sum is σ = 1220226810372. Its totient is φ = 1220215229632.

The previous prime is 1220221019981. The next prime is 1220221020017. The reversal of 1220221020001 is 1000201220221.

It is a happy number.

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 1003605243601 + 216615776400 = 1001801^2 + 465420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220221020001 - 2¹⁵ = 1220220987233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220221020101) 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, 2566660 + ... + 3004693.

It is an arithmetic number, because the mean of its divisors is an integer number (305056702593).

Almost surely, 2^{1220221020001} is an apocalyptic number.

It is an amenable number.

1220221020001 is a deficient number, since it is larger than the sum of its proper divisors (5790371).

1220221020001 is an equidigital number, since it uses as much as digits as its factorization.

1220221020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790370.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1220221020001 its reverse (1000201220221), we get a palindrome (2220422240222).

The spelling of 1220221020001 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, twenty thousand, one".