1131201321 has 8 divisors (see below), whose sum is σ = 1519119840. Its totient is φ = 748708512.

The previous prime is 1131201299. The next prime is 1131201329. The reversal of 1131201321 is 1231021311.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1131201321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131201321.

It is not an unprimeable number, because it can be changed into a prime (1131201329) 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, 1355940 + ... + 1356773.

It is an arithmetic number, because the mean of its divisors is an integer number (189889980).

Almost surely, 2^1131201321 is an apocalyptic number.

It is an amenable number.

1131201321 is a deficient number, since it is larger than the sum of its proper divisors (387918519).

1131201321 is a wasteful number, since it uses less digits than its factorization.

1131201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712855.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1131201321 is about 33633.3364535843. The cubic root of 1131201321 is about 1041.9494135008.

Adding to 1131201321 its reverse (1231021311), we get a palindrome (2362222632).

The spelling of 1131201321 in words is "one billion, one hundred thirty-one million, two hundred one thousand, three hundred twenty-one".