11131032421 has 4 divisors (see below), whose sum is σ = 11785799052. Its totient is φ = 10476265792.

The previous prime is 11131032389. The next prime is 11131032427. The reversal of 11131032421 is 12423013111.

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 6494103396 + 4636929025 = 80586^2 + 68095^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131032421 - 2⁵ = 11131032389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131032427) 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, 327383290 + ... + 327383323.

It is an arithmetic number, because the mean of its divisors is an integer number (2946449763).

Almost surely, 2^11131032421 is an apocalyptic number.

It is an amenable number.

11131032421 is a deficient number, since it is larger than the sum of its proper divisors (654766631).

11131032421 is an equidigital number, since it uses as much as digits as its factorization.

11131032421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654766630.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 11131032421 its reverse (12423013111), we get a palindrome (23554045532).

The spelling of 11131032421 in words is "eleven billion, one hundred thirty-one million, thirty-two thousand, four hundred twenty-one".