21042298 has 4 divisors (see below), whose sum is σ = 31563450. Its totient is φ = 10521148.

The previous prime is 21042293. The next prime is 21042317. The reversal of 21042298 is 89224012.

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., 20548089 + 494209 = 4533^2 + 703^2 .

It is not an unprimeable number, because it can be changed into a prime (21042293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260573 + ... + 5260576.

Almost surely, 2^21042298 is an apocalyptic number.

21042298 is a deficient number, since it is larger than the sum of its proper divisors (10521152).

21042298 is a wasteful number, since it uses less digits than its factorization.

21042298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521151.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21042298 is about 4587.1884635362. The cubic root of 21042298 is about 276.0775267054.

The spelling of 21042298 in words is "twenty-one million, forty-two thousand, two hundred ninety-eight".