21047374 has 8 divisors (see below), whose sum is σ = 31617720. Its totient is φ = 10508136.

The previous prime is 21047371. The next prime is 21047387. The reversal of 21047374 is 47374012.

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 (21047371) 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, 6004 + ... + 8839.

It is an arithmetic number, because the mean of its divisors is an integer number (3952215).

Almost surely, 2^21047374 is an apocalyptic number.

21047374 is a deficient number, since it is larger than the sum of its proper divisors (10570346).

21047374 is a wasteful number, since it uses less digits than its factorization.

21047374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15554.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 21047374 is about 4587.7417102535. The cubic root of 21047374 is about 276.0997241678.

The spelling of 21047374 in words is "twenty-one million, forty-seven thousand, three hundred seventy-four".