1140405221 has 4 divisors (see below), whose sum is σ = 1143114444. Its totient is φ = 1137696000.

The previous prime is 1140405199. The next prime is 1140405229. The reversal of 1140405221 is 1225040411.

It is a happy number.

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 50481025 + 1089924196 = 7105^2 + 33014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1140405221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1140405193 and 1140405202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1140405229) 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, 1353980 + ... + 1354821.

It is an arithmetic number, because the mean of its divisors is an integer number (285778611).

Almost surely, 2^1140405221 is an apocalyptic number.

It is an amenable number.

1140405221 is a deficient number, since it is larger than the sum of its proper divisors (2709223).

1140405221 is an equidigital number, since it uses as much as digits as its factorization.

1140405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709222.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1140405221 is about 33769.8863042208. The cubic root of 1140405221 is about 1044.7676874978.

Adding to 1140405221 its reverse (1225040411), we get a palindrome (2365445632).

The spelling of 1140405221 in words is "one billion, one hundred forty million, four hundred five thousand, two hundred twenty-one".