21060238 has 4 divisors (see below), whose sum is σ = 31590360. Its totient is φ = 10530118.

The previous prime is 21060211. The next prime is 21060257. The reversal of 21060238 is 83206012.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5265058 + ... + 5265061.

It is an arithmetic number, because the mean of its divisors is an integer number (7897590).

Almost surely, 2^21060238 is an apocalyptic number.

21060238 is a deficient number, since it is larger than the sum of its proper divisors (10530122).

21060238 is a wasteful number, since it uses less digits than its factorization.

21060238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10530121.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21060238 is about 4589.1434930714. The cubic root of 21060238 is about 276.1559627513.

The spelling of 21060238 in words is "twenty-one million, sixty thousand, two hundred thirty-eight".