21047294 has 8 divisors (see below), whose sum is σ = 31592160. Its totient is φ = 10516576.

The previous prime is 21047281. The next prime is 21047303. The reversal of 21047294 is 49274012.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (3949020).

Almost surely, 2^21047294 is an apocalyptic number.

21047294 is a deficient number, since it is larger than the sum of its proper divisors (10544866).

21047294 is a wasteful number, since it uses less digits than its factorization.

21047294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21047294 is about 4587.7329913586. The cubic root of 21047294 is about 276.0993743537.

The spelling of 21047294 in words is "twenty-one million, forty-seven thousand, two hundred ninety-four".