21043454 has 16 divisors (see below), whose sum is σ = 32604000. Its totient is φ = 10178784.

The previous prime is 21043453. The next prime is 21043457. The reversal of 21043454 is 45434012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043453) 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, 14012 + ... + 15440.

It is an arithmetic number, because the mean of its divisors is an integer number (2037750).

Almost surely, 2^21043454 is an apocalyptic number.

21043454 is a deficient number, since it is larger than the sum of its proper divisors (11560546).

21043454 is a wasteful number, since it uses less digits than its factorization.

21043454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667.

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

The square root of 21043454 is about 4587.3144649130. The cubic root of 21043454 is about 276.0825822333.

Adding to 21043454 its reverse (45434012), we get a palindrome (66477466).

The spelling of 21043454 in words is "twenty-one million, forty-three thousand, four hundred fifty-four".