1131424221 has 16 divisors (see below), whose sum is σ = 1551312000. Its totient is φ = 732961728.

The previous prime is 1131424219. The next prime is 1131424309. The reversal of 1131424221 is 1224241311.

It is not a de Polignac number, because 1131424221 - 2¹ = 1131424219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131424201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87055 + ... + 99203.

It is an arithmetic number, because the mean of its divisors is an integer number (96957000).

Almost surely, 2^1131424221 is an apocalyptic number.

It is an amenable number.

1131424221 is a deficient number, since it is larger than the sum of its proper divisors (419887779).

1131424221 is a wasteful number, since it uses less digits than its factorization.

1131424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028.

The product of its digits is 384, while the sum is 21.

The square root of 1131424221 is about 33636.6499669631. The cubic root of 1131424221 is about 1042.0178467280.

Adding to 1131424221 its reverse (1224241311), we get a palindrome (2355665532).

The spelling of 1131424221 in words is "one billion, one hundred thirty-one million, four hundred twenty-four thousand, two hundred twenty-one".