1331140421 has 8 divisors (see below), whose sum is σ = 1460584440. Its totient is φ = 1205560512.

The previous prime is 1331140381. The next prime is 1331140423. The reversal of 1331140421 is 1240411331.

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 1330060900 = 1039^2 + 36470^2 .

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-1331140421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331140393 and 1331140402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331140423) 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, 965306 + ... + 966683.

It is an arithmetic number, because the mean of its divisors is an integer number (182573055).

Almost surely, 2^1331140421 is an apocalyptic number.

It is an amenable number.

1331140421 is a deficient number, since it is larger than the sum of its proper divisors (129444019).

1331140421 is a wasteful number, since it uses less digits than its factorization.

1331140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932055.

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

The square root of 1331140421 is about 36484.7971215409. The cubic root of 1331140421 is about 1100.0386821108.

Adding to 1331140421 its reverse (1240411331), we get a palindrome (2571551752).

The spelling of 1331140421 in words is "one billion, three hundred thirty-one million, one hundred forty thousand, four hundred twenty-one".