21454043 has 24 divisors (see below), whose sum is σ = 24700608. Its totient is φ = 18600192.

The previous prime is 21454039. The next prime is 21454049. The reversal of 21454043 is 34045412.

It is not a de Polignac number, because 21454043 - 2² = 21454039 is a prime.

It is a super-2 number, since 2×21454043² = 920551922091698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21454049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 293855 + ... + 293927.

It is an arithmetic number, because the mean of its divisors is an integer number (1029192).

Almost surely, 2^21454043 is an apocalyptic number.

21454043 is a deficient number, since it is larger than the sum of its proper divisors (3246565).

21454043 is a wasteful number, since it uses less digits than its factorization.

21454043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 21454043 is about 4631.8509259258. The cubic root of 21454043 is about 277.8666225260.

Adding to 21454043 its reverse (34045412), we get a palindrome (55499455).

The spelling of 21454043 in words is "twenty-one million, four hundred fifty-four thousand, forty-three".