21140043 has 8 divisors (see below), whose sum is σ = 29158800. Its totient is φ = 13607328.

The previous prime is 21140033. The next prime is 21140069. The reversal of 21140043 is 34004112.

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

It is not a de Polignac number, because 21140043 - 2⁵ = 21140011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21140003) 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, 121408 + ... + 121581.

It is an arithmetic number, because the mean of its divisors is an integer number (3644850).

Almost surely, 2^21140043 is an apocalyptic number.

21140043 is a deficient number, since it is larger than the sum of its proper divisors (8018757).

21140043 is a wasteful number, since it uses less digits than its factorization.

21140043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243021.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21140043 is about 4597.8302491501. The cubic root of 21140043 is about 276.5043419667.

Adding to 21140043 its reverse (34004112), we get a palindrome (55144155).

The spelling of 21140043 in words is "twenty-one million, one hundred forty thousand, forty-three".