21338426 has 4 divisors (see below), whose sum is σ = 32007642. Its totient is φ = 10669212.

The previous prime is 21338357. The next prime is 21338431. The reversal of 21338426 is 62483312.

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., 18619225 + 2719201 = 4315^2 + 1649^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5334605 + ... + 5334608.

Almost surely, 2^21338426 is an apocalyptic number.

21338426 is a deficient number, since it is larger than the sum of its proper divisors (10669216).

21338426 is a wasteful number, since it uses less digits than its factorization.

21338426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10669215.

The product of its digits is 6912, while the sum is 29.

The square root of 21338426 is about 4619.3534179580. The cubic root of 21338426 is about 277.3665770959.

The spelling of 21338426 in words is "twenty-one million, three hundred thirty-eight thousand, four hundred twenty-six".