21131403043 has 4 divisors (see below), whose sum is σ = 21137608800. Its totient is φ = 21125197288.

The previous prime is 21131402989. The next prime is 21131403067. The reversal of 21131403043 is 34030413112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21131403043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131401043) 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, 3097768 + ... + 3104581.

It is an arithmetic number, because the mean of its divisors is an integer number (5284402200).

Almost surely, 2^21131403043 is an apocalyptic number.

21131403043 is a deficient number, since it is larger than the sum of its proper divisors (6205757).

21131403043 is an equidigital number, since it uses as much as digits as its factorization.

21131403043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6205756.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21131403043 its reverse (34030413112), we get a palindrome (55161816155).

The spelling of 21131403043 in words is "twenty-one billion, one hundred thirty-one million, four hundred three thousand, forty-three".