21035043 has 6 divisors (see below), whose sum is σ = 30383964. Its totient is φ = 14023356.

The previous prime is 21035029. The next prime is 21035059. The reversal of 21035043 is 34053012.

It is not a de Polignac number, because 21035043 - 2⁸ = 21034787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21030043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1168605 + ... + 1168622.

It is an arithmetic number, because the mean of its divisors is an integer number (5063994).

Almost surely, 2^21035043 is an apocalyptic number.

21035043 is a deficient number, since it is larger than the sum of its proper divisors (9348921).

21035043 is a wasteful number, since it uses less digits than its factorization.

21035043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337233 (or 2337230 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21035043 is about 4586.3976059648. The cubic root of 21035043 is about 276.0457942287.

Adding to 21035043 its reverse (34053012), we get a palindrome (55088055).

It can be divided in two parts, 210 and 35043, that added together give a palindrome (35253).

The spelling of 21035043 in words is "twenty-one million, thirty-five thousand, forty-three".