21275043 has 4 divisors (see below), whose sum is σ = 28366728. Its totient is φ = 14183360.

The previous prime is 21275039. The next prime is 21275053. The reversal of 21275043 is 34057212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21275043 - 2² = 21275039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21275053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545838 + ... + 3545843.

It is an arithmetic number, because the mean of its divisors is an integer number (7091682).

Almost surely, 2^21275043 is an apocalyptic number.

21275043 is a deficient number, since it is larger than the sum of its proper divisors (7091685).

21275043 is an equidigital number, since it uses as much as digits as its factorization.

21275043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091684.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21275043 is about 4612.4877235609. The cubic root of 21275043 is about 277.0916777005.

The spelling of 21275043 in words is "twenty-one million, two hundred seventy-five thousand, forty-three".