21432454 has 4 divisors (see below), whose sum is σ = 32148684. Its totient is φ = 10716226.

The previous prime is 21432443. The next prime is 21432473. The reversal of 21432454 is 45423412.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358112 + ... + 5358115.

It is an arithmetic number, because the mean of its divisors is an integer number (8037171).

Almost surely, 2^21432454 is an apocalyptic number.

21432454 is a deficient number, since it is larger than the sum of its proper divisors (10716230).

21432454 is a wasteful number, since it uses less digits than its factorization.

21432454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716229.

The product of its digits is 3840, while the sum is 25.

The square root of 21432454 is about 4629.5198455131. The cubic root of 21432454 is about 277.7733863958.

Adding to 21432454 its reverse (45423412), we get a palindrome (66855866).

The spelling of 21432454 in words is "twenty-one million, four hundred thirty-two thousand, four hundred fifty-four".