21498374 has 8 divisors (see below), whose sum is σ = 32701968. Its totient is φ = 10597720.

The previous prime is 21498343. The next prime is 21498377. The reversal of 21498374 is 47389412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75557 + ... + 75840.

It is an arithmetic number, because the mean of its divisors is an integer number (4087746).

Almost surely, 2^21498374 is an apocalyptic number.

21498374 is a deficient number, since it is larger than the sum of its proper divisors (11203594).

21498374 is a wasteful number, since it uses less digits than its factorization.

21498374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151470.

The product of its digits is 48384, while the sum is 38.

The square root of 21498374 is about 4636.6339083434. The cubic root of 21498374 is about 278.0578783275.

The spelling of 21498374 in words is "twenty-one million, four hundred ninety-eight thousand, three hundred seventy-four".