21431041 has 4 divisors (see below), whose sum is σ = 21702400. Its totient is φ = 21159684.

The previous prime is 21431023. The next prime is 21431057. The reversal of 21431041 is 14013412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21431041 - 2⁹ = 21430529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431141) 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, 135561 + ... + 135718.

It is an arithmetic number, because the mean of its divisors is an integer number (5425600).

Almost surely, 2^21431041 is an apocalyptic number.

It is an amenable number.

21431041 is a deficient number, since it is larger than the sum of its proper divisors (271359).

21431041 is an equidigital number, since it uses as much as digits as its factorization.

21431041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271358.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21431041 is about 4629.3672353789. The cubic root of 21431041 is about 277.7672819086.

Adding to 21431041 its reverse (14013412), we get a palindrome (35444453).

The spelling of 21431041 in words is "twenty-one million, four hundred thirty-one thousand, forty-one".