21431035 has 8 divisors (see below), whose sum is σ = 25953840. Its totient is φ = 16987104.

The previous prime is 21431023. The next prime is 21431057. The reversal of 21431035 is 53013412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21431035 is a prime.

It is a super-2 number, since 2×21431035² = 918578522342450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19117 + ... + 20206.

It is an arithmetic number, because the mean of its divisors is an integer number (3244230).

Almost surely, 2^21431035 is an apocalyptic number.

21431035 is a deficient number, since it is larger than the sum of its proper divisors (4522805).

21431035 is a wasteful number, since it uses less digits than its factorization.

21431035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39437.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21431035 is about 4629.3665873422. The cubic root of 21431035 is about 277.7672559866.

Adding to 21431035 its reverse (53013412), we get a palindrome (74444447).

It can be divided in two parts, 21 and 431035, that added together give a triangular number (431056 = T₉₂₈).

The spelling of 21431035 in words is "twenty-one million, four hundred thirty-one thousand, thirty-five".