1131013011221 has 4 divisors (see below), whose sum is σ = 1131016937292. Its totient is φ = 1131009085152.

The previous prime is 1131013011217. The next prime is 1131013011283. The reversal of 1131013011221 is 1221103101311.

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 874206300100 + 256806711121 = 934990^2 + 506761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131013011221 - 2² = 1131013011217 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 1131013011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131013011721) 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, 1493480 + ... + 2119553.

It is an arithmetic number, because the mean of its divisors is an integer number (282754234323).

Almost surely, 2^{1131013011221} is an apocalyptic number.

It is an amenable number.

1131013011221 is a deficient number, since it is larger than the sum of its proper divisors (3926071).

1131013011221 is an equidigital number, since it uses as much as digits as its factorization.

1131013011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926070.

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

Adding to 1131013011221 its reverse (1221103101311), we get a palindrome (2352116112532).

The spelling of 1131013011221 in words is "one trillion, one hundred thirty-one billion, thirteen million, eleven thousand, two hundred twenty-one".