21394798 has 8 divisors (see below), whose sum is σ = 33781320. Its totient is φ = 10134360.

The previous prime is 21394781. The next prime is 21394819. The reversal of 21394798 is 89749312.

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

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, 281473 + ... + 281548.

It is an arithmetic number, because the mean of its divisors is an integer number (4222665).

Almost surely, 2^21394798 is an apocalyptic number.

21394798 is a deficient number, since it is larger than the sum of its proper divisors (12386522).

21394798 is a wasteful number, since it uses less digits than its factorization.

21394798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563042.

The product of its digits is 108864, while the sum is 43.

The square root of 21394798 is about 4625.4511131348. The cubic root of 21394798 is about 277.6106119655.

The spelling of 21394798 in words is "twenty-one million, three hundred ninety-four thousand, seven hundred ninety-eight".