21132043 has 8 divisors (see below), whose sum is σ = 21386880. Its totient is φ = 20879040.

The previous prime is 21132011. The next prime is 21132061. The reversal of 21132043 is 34023112.

It is a happy number.

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 21132043 - 2⁵ = 21132011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43878 + ... + 44356.

It is an arithmetic number, because the mean of its divisors is an integer number (2673360).

Almost surely, 2^21132043 is an apocalyptic number.

21132043 is a deficient number, since it is larger than the sum of its proper divisors (254837).

21132043 is a wasteful number, since it uses less digits than its factorization.

21132043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21132043 is about 4596.9601912568. The cubic root of 21132043 is about 276.4694585020.

Adding to 21132043 its reverse (34023112), we get a palindrome (55155155).

The spelling of 21132043 in words is "twenty-one million, one hundred thirty-two thousand, forty-three".