21103043 has 8 divisors (see below), whose sum is σ = 22827168. Its totient is φ = 19393344.

The previous prime is 21103021. The next prime is 21103051. The reversal of 21103043 is 34030112.

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

It is a cyclic number.

It is not a de Polignac number, because 21103043 - 2⁶ = 21102979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455 + ... + 6512.

It is an arithmetic number, because the mean of its divisors is an integer number (2853396).

Almost surely, 2^21103043 is an apocalyptic number.

21103043 is a deficient number, since it is larger than the sum of its proper divisors (1724125).

21103043 is a wasteful number, since it uses less digits than its factorization.

21103043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21103043 is about 4593.8048500127. The cubic root of 21103043 is about 276.3429320909.

Adding to 21103043 its reverse (34030112), we get a palindrome (55133155).

The spelling of 21103043 in words is "twenty-one million, one hundred three thousand, forty-three".