1131011101221 has 4 divisors (see below), whose sum is σ = 1508014801632. Its totient is φ = 754007400812.

The previous prime is 1131011101219. The next prime is 1131011101223. The reversal of 1131011101221 is 1221011101311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1131011101219) and next prime (1131011101223).

It is a cyclic number.

It is not a de Polignac number, because 1131011101221 - 2¹ = 1131011101219 is a prime.

It is a super-2 number, since 2×1131011101221² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131011101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131011101223) 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, 188501850201 + ... + 188501850206.

It is an arithmetic number, because the mean of its divisors is an integer number (377003700408).

Almost surely, 2^{1131011101221} is an apocalyptic number.

It is an amenable number.

1131011101221 is a deficient number, since it is larger than the sum of its proper divisors (377003700411).

1131011101221 is an equidigital number, since it uses as much as digits as its factorization.

1131011101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377003700410.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 1131011101221 its reverse (1221011101311), we get a palindrome (2352022202532).

The spelling of 1131011101221 in words is "one trillion, one hundred thirty-one billion, eleven million, one hundred one thousand, two hundred twenty-one".