21994298 has 4 divisors (see below), whose sum is σ = 32991450. Its totient is φ = 10997148.

The previous prime is 21994237. The next prime is 21994319. The reversal of 21994298 is 89249912.

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

It can be written as a sum of positive squares in only one way, i.e., 14115049 + 7879249 = 3757^2 + 2807^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5498573 + ... + 5498576.

Almost surely, 2^21994298 is an apocalyptic number.

21994298 is a deficient number, since it is larger than the sum of its proper divisors (10997152).

21994298 is a wasteful number, since it uses less digits than its factorization.

21994298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10997151.

The product of its digits is 93312, while the sum is 44.

The square root of 21994298 is about 4689.8078851910. The cubic root of 21994298 is about 280.1797230522.

The spelling of 21994298 in words is "twenty-one million, nine hundred ninety-four thousand, two hundred ninety-eight".