1220101311311 has 4 divisors (see below), whose sum is σ = 1238311778712. Its totient is φ = 1201890843912.

The previous prime is 1220101311293. The next prime is 1220101311349. The reversal of 1220101311311 is 1131131010221.

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-1220101311311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220101311311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220101311361) 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, 9105233600 + ... + 9105233733.

It is an arithmetic number, because the mean of its divisors is an integer number (309577944678).

Almost surely, 2^{1220101311311} is an apocalyptic number.

1220101311311 is a deficient number, since it is larger than the sum of its proper divisors (18210467401).

1220101311311 is an equidigital number, since it uses as much as digits as its factorization.

1220101311311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18210467400.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1220101311311 its reverse (1131131010221), we get a palindrome (2351232321532).

The spelling of 1220101311311 in words is "one trillion, two hundred twenty billion, one hundred one million, three hundred eleven thousand, three hundred eleven".