21456374 has 8 divisors (see below), whose sum is σ = 33054528. Its totient is φ = 10438200.

The previous prime is 21456373. The next prime is 21456403. The reversal of 21456374 is 47365412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21456374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21456373) 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, 144902 + ... + 145049.

It is an arithmetic number, because the mean of its divisors is an integer number (4131816).

Almost surely, 2^21456374 is an apocalyptic number.

21456374 is a deficient number, since it is larger than the sum of its proper divisors (11598154).

21456374 is a wasteful number, since it uses less digits than its factorization.

21456374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289990.

The product of its digits is 20160, while the sum is 32.

The square root of 21456374 is about 4632.1025463606. The cubic root of 21456374 is about 277.8766856430.

The spelling of 21456374 in words is "twenty-one million, four hundred fifty-six thousand, three hundred seventy-four".