21226138 has 8 divisors (see below), whose sum is σ = 31887360. Its totient is φ = 10597020.

The previous prime is 21226111. The next prime is 21226141. The reversal of 21226138 is 83162212.

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, 6298 + ... + 9061.

It is an arithmetic number, because the mean of its divisors is an integer number (3985920).

Almost surely, 2^21226138 is an apocalyptic number.

21226138 is a deficient number, since it is larger than the sum of its proper divisors (10661222).

21226138 is a wasteful number, since it uses less digits than its factorization.

21226138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16052.

The product of its digits is 1152, while the sum is 25.

The square root of 21226138 is about 4607.1833043629. The cubic root of 21226138 is about 276.8791976732.

The spelling of 21226138 in words is "twenty-one million, two hundred twenty-six thousand, one hundred thirty-eight".