21334170 has 64 divisors (see below), whose sum is σ = 60165504. Its totient is φ = 4773120.

The previous prime is 21334153. The next prime is 21334171. The reversal of 21334170 is 7143312.

21334170 = T₁₉₆₄ + T₁₉₆₅ + ... + T₁₉₇₄.

It is a plaindrome in base 16.

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 in 31 ways as a sum of consecutive naturals, for example, 1804 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (940086).

Almost surely, 2^21334170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21334170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30082752).

21334170 is an abundant number, since it is smaller than the sum of its proper divisors (38831334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21334170 is a wasteful number, since it uses less digits than its factorization.

21334170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21334170 is about 4618.8927244525. The cubic root of 21334170 is about 277.3481353945.

Adding to 21334170 its reverse (7143312), we get a palindrome (28477482).

The spelling of 21334170 in words is "twenty-one million, three hundred thirty-four thousand, one hundred seventy".