21334172 has 6 divisors (see below), whose sum is σ = 37334808. Its totient is φ = 10667084.

The previous prime is 21334171. The next prime is 21334189. The reversal of 21334172 is 27143312.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666768 + ... + 2666775.

It is an arithmetic number, because the mean of its divisors is an integer number (6222468).

Almost surely, 2^21334172 is an apocalyptic number.

It is an amenable number.

21334172 is a deficient number, since it is larger than the sum of its proper divisors (16000636).

21334172 is a wasteful number, since it uses less digits than its factorization.

21334172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333547 (or 5333545 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 21334172 is about 4618.8929409546. The cubic root of 21334172 is about 277.3481440613.

Adding to 21334172 its reverse (27143312), we get a palindrome (48477484).

The spelling of 21334172 in words is "twenty-one million, three hundred thirty-four thousand, one hundred seventy-two".