1131234221 has 8 divisors (see below), whose sum is σ = 1218751800. Its totient is φ = 1043788032.

The previous prime is 1131234197. The next prime is 1131234283. The reversal of 1131234221 is 1224321311.

It can be written as a sum of positive squares in 4 ways, for example, as 134884996 + 996349225 = 11614^2 + 31565^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131234221 - 2¹⁰ = 1131233197 is a prime.

It is a super-2 number, since 2×1131234221² = 2559381725522953682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131234193 and 1131234202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131234121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17705 + ... + 50753.

It is an arithmetic number, because the mean of its divisors is an integer number (152343975).

Almost surely, 2^1131234221 is an apocalyptic number.

It is an amenable number.

1131234221 is a deficient number, since it is larger than the sum of its proper divisors (87517579).

1131234221 is a wasteful number, since it uses less digits than its factorization.

1131234221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35695.

The product of its digits is 288, while the sum is 20.

The square root of 1131234221 is about 33633.8255480996. The cubic root of 1131234221 is about 1041.9595147983.

Adding to 1131234221 its reverse (1224321311), we get a palindrome (2355555532).

The spelling of 1131234221 in words is "one billion, one hundred thirty-one million, two hundred thirty-four thousand, two hundred twenty-one".