1220121100201 has 16 divisors (see below), whose sum is σ = 1307732253696. Its totient is φ = 1135596558096.

The previous prime is 1220121100169. The next prime is 1220121100213. The reversal of 1220121100201 is 1020011210221.

It is a cyclic number.

It is not a de Polignac number, because 1220121100201 - 2⁵ = 1220121100169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220121100271) 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, 2085315 + ... + 2605528.

It is an arithmetic number, because the mean of its divisors is an integer number (81733265856).

Almost surely, 2^{1220121100201} is an apocalyptic number.

It is an amenable number.

1220121100201 is a deficient number, since it is larger than the sum of its proper divisors (87611153495).

1220121100201 is a wasteful number, since it uses less digits than its factorization.

1220121100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691172.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220121100201 its reverse (1020011210221), we get a palindrome (2240132310422).

The spelling of 1220121100201 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred thousand, two hundred one".