21012298 has 8 divisors (see below), whose sum is σ = 32605380. Its totient is φ = 10143840.

The previous prime is 21012283. The next prime is 21012301. The reversal of 21012298 is 89221012.

It can be written as a sum of positive squares in 2 ways, for example, as 18429849 + 2582449 = 4293^2 + 1607^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181083 + ... + 181198.

Almost surely, 2^21012298 is an apocalyptic number.

21012298 is a deficient number, since it is larger than the sum of its proper divisors (11593082).

21012298 is a wasteful number, since it uses less digits than its factorization.

21012298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362312.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21012298 is about 4583.9173203713. The cubic root of 21012298 is about 275.9462630801.

The spelling of 21012298 in words is "twenty-one million, twelve thousand, two hundred ninety-eight".