1131021121 has 4 divisors (see below), whose sum is σ = 1158607044. Its totient is φ = 1103435200.

The previous prime is 1131021097. The next prime is 1131021139. The reversal of 1131021121 is 1211201311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1211201311 = 12553 ⋅96487.

It can be written as a sum of positive squares in 2 ways, for example, as 286828096 + 844193025 = 16936^2 + 29055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131021121 - 2⁷ = 1131020993 is a prime.

It is a super-2 number, since 2×1131021121² = 2558417552296193282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131021421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13792900 + ... + 13792981.

It is an arithmetic number, because the mean of its divisors is an integer number (289651761).

Almost surely, 2^1131021121 is an apocalyptic number.

It is an amenable number.

1131021121 is a deficient number, since it is larger than the sum of its proper divisors (27585923).

1131021121 is an equidigital number, since it uses as much as digits as its factorization.

1131021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27585922.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1131021121 is about 33630.6574571476. The cubic root of 1131021121 is about 1041.8940831625.

Adding to 1131021121 its reverse (1211201311), we get a palindrome (2342222432).

The spelling of 1131021121 in words is "one billion, one hundred thirty-one million, twenty-one thousand, one hundred twenty-one".