21438202 has 8 divisors (see below), whose sum is σ = 32598036. Its totient is φ = 10572192.

The previous prime is 21438187. The next prime is 21438211. The reversal of 21438202 is 20283412.

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 103041 = 4619^2 + 321^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73273 + ... + 73564.

Almost surely, 2^21438202 is an apocalyptic number.

21438202 is a deficient number, since it is larger than the sum of its proper divisors (11159834).

21438202 is a wasteful number, since it uses less digits than its factorization.

21438202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146912.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21438202 is about 4630.1406026167. The cubic root of 21438202 is about 277.7982163213.

It can be divided in two parts, 214 and 38202, that added together give a 4-th power (38416 = 14⁴).

The spelling of 21438202 in words is "twenty-one million, four hundred thirty-eight thousand, two hundred two".