21238682 has 4 divisors (see below), whose sum is σ = 31858026. Its totient is φ = 10619340.

The previous prime is 21238681. The next prime is 21238687. The reversal of 21238682 is 28683212.

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., 20967241 + 271441 = 4579^2 + 521^2 .

It is a super-2 number, since 2×21238682² = 902163226194248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21238681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5309669 + ... + 5309672.

Almost surely, 2^21238682 is an apocalyptic number.

21238682 is a deficient number, since it is larger than the sum of its proper divisors (10619344).

21238682 is a wasteful number, since it uses less digits than its factorization.

21238682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10619343.

The product of its digits is 9216, while the sum is 32.

The square root of 21238682 is about 4608.5444556823. The cubic root of 21238682 is about 276.9337293188.

The spelling of 21238682 in words is "twenty-one million, two hundred thirty-eight thousand, six hundred eighty-two".