21238762 has 4 divisors (see below), whose sum is σ = 31858146. Its totient is φ = 10619380.

The previous prime is 21238757. The next prime is 21238843. The reversal of 21238762 is 26783212.

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., 15280281 + 5958481 = 3909^2 + 2441^2 .

It is a super-2 number, since 2×21238762² = 902170022585288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 5309689 + ... + 5309692.

Almost surely, 2^21238762 is an apocalyptic number.

21238762 is a deficient number, since it is larger than the sum of its proper divisors (10619384).

21238762 is a wasteful number, since it uses less digits than its factorization.

21238762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10619383.

The product of its digits is 8064, while the sum is 31.

The square root of 21238762 is about 4608.5531352041. The cubic root of 21238762 is about 276.9340770282.

The spelling of 21238762 in words is "twenty-one million, two hundred thirty-eight thousand, seven hundred sixty-two".