21198094 has 4 divisors (see below), whose sum is σ = 31797144. Its totient is φ = 10599046.

The previous prime is 21198083. The next prime is 21198103. The reversal of 21198094 is 49089112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5299522 + ... + 5299525.

It is an arithmetic number, because the mean of its divisors is an integer number (7949286).

Almost surely, 2^21198094 is an apocalyptic number.

21198094 is a deficient number, since it is larger than the sum of its proper divisors (10599050).

21198094 is a wasteful number, since it uses less digits than its factorization.

21198094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10599049.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 21198094 is about 4604.1387902625. The cubic root of 21198094 is about 276.7572062186.

The spelling of 21198094 in words is "twenty-one million, one hundred ninety-eight thousand, ninety-four".