1131432021 has 12 divisors (see below), whose sum is σ = 1634756448. Its totient is φ = 754073064.

The previous prime is 1131431993. The next prime is 1131432047. The reversal of 1131432021 is 1202341311.

1131432021 is a `hidden beast` number, since 11 + 314 + 320 + 21 = 666.

It is not a de Polignac number, because 1131432021 - 2⁵ = 1131431989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131431985 and 1131432003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131432221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19546 + ... + 51428.

It is an arithmetic number, because the mean of its divisors is an integer number (136229704).

Almost surely, 2^1131432021 is an apocalyptic number.

It is an amenable number.

1131432021 is a deficient number, since it is larger than the sum of its proper divisors (503324427).

1131432021 is a wasteful number, since it uses less digits than its factorization.

1131432021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35832 (or 35829 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1131432021 is about 33636.7659117223. The cubic root of 1131432021 is about 1042.0202412677.

Adding to 1131432021 its reverse (1202341311), we get a palindrome (2333773332).

The spelling of 1131432021 in words is "one billion, one hundred thirty-one million, four hundred thirty-two thousand, twenty-one".