21315298 has 4 divisors (see below), whose sum is σ = 31972950. Its totient is φ = 10657648.

The previous prime is 21315289. The next prime is 21315341. The reversal of 21315298 is 89251312.

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., 15000129 + 6315169 = 3873^2 + 2513^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328823 + ... + 5328826.

Almost surely, 2^21315298 is an apocalyptic number.

21315298 is a deficient number, since it is larger than the sum of its proper divisors (10657652).

21315298 is a wasteful number, since it uses less digits than its factorization.

21315298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10657651.

The product of its digits is 4320, while the sum is 31.

The square root of 21315298 is about 4616.8493585994. The cubic root of 21315298 is about 277.2663314447.

The spelling of 21315298 in words is "twenty-one million, three hundred fifteen thousand, two hundred ninety-eight".