1220101101211 has 4 divisors (see below), whose sum is σ = 1225163761624. Its totient is φ = 1215038440800.

The previous prime is 1220101101173. The next prime is 1220101101251. The reversal of 1220101101211 is 1121011010221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220101101211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220101101191 and 1220101101200.

It is not an unprimeable number, because it can be changed into a prime (1220101101251) 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, 2531329845 + ... + 2531330326.

It is an arithmetic number, because the mean of its divisors is an integer number (306290940406).

Almost surely, 2^{1220101101211} is an apocalyptic number.

1220101101211 is a deficient number, since it is larger than the sum of its proper divisors (5062660413).

1220101101211 is an equidigital number, since it uses as much as digits as its factorization.

1220101101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062660412.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1220101101211 its reverse (1121011010221), we get a palindrome (2341112111432).

It can be divided in two parts, 122010 and 1101211, that added together give a palindrome (1223221).

The spelling of 1220101101211 in words is "one trillion, two hundred twenty billion, one hundred one million, one hundred one thousand, two hundred eleven".