21417084 has 36 divisors (see below), whose sum is σ = 58303336. Its totient is φ = 6589728.

The previous prime is 21417031. The next prime is 21417089. The reversal of 21417084 is 48071412.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22414 + ... + 23349.

Almost surely, 2^21417084 is an apocalyptic number.

It is an amenable number.

21417084 is an abundant number, since it is smaller than the sum of its proper divisors (36886252).

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

21417084 is a wasteful number, since it uses less digits than its factorization.

21417084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45786 (or 45781 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21417084 is about 4627.8595484306. The cubic root of 21417084 is about 277.7069700173.

Adding to 21417084 its reverse (48071412), we get a palindrome (69488496).

It can be divided in two parts, 2 and 1417084, that added together give a triangular number (1417086 = T₁₆₈₃).

The spelling of 21417084 in words is "twenty-one million, four hundred seventeen thousand, eighty-four".