21432754 has 8 divisors (see below), whose sum is σ = 36741888. Its totient is φ = 9185460.

The previous prime is 21432751. The next prime is 21432781. The reversal of 21432754 is 45723412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21432751) 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 3 ways as a sum of consecutive naturals, for example, 765442 + ... + 765469.

It is an arithmetic number, because the mean of its divisors is an integer number (4592736).

Almost surely, 2^21432754 is an apocalyptic number.

21432754 is a deficient number, since it is larger than the sum of its proper divisors (15309134).

21432754 is a wasteful number, since it uses less digits than its factorization.

21432754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530920.

The product of its digits is 6720, while the sum is 28.

The square root of 21432754 is about 4629.5522461681. The cubic root of 21432754 is about 277.7746824307.

The spelling of 21432754 in words is "twenty-one million, four hundred thirty-two thousand, seven hundred fifty-four".