21233138 has 8 divisors (see below), whose sum is σ = 31871232. Its totient is φ = 10609396.

The previous prime is 21233131. The next prime is 21233161. The reversal of 21233138 is 83133212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21233138² = 901692298654088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21233131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (3983904).

Almost surely, 2^21233138 is an apocalyptic number.

21233138 is a deficient number, since it is larger than the sum of its proper divisors (10638094).

21233138 is a wasteful number, since it uses less digits than its factorization.

21233138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7176.

The product of its digits is 864, while the sum is 23.

The square root of 21233138 is about 4607.9429249938. The cubic root of 21233138 is about 276.9096309275.

The spelling of 21233138 in words is "twenty-one million, two hundred thirty-three thousand, one hundred thirty-eight".