21416172 has 24 divisors (see below), whose sum is σ = 50459136. Its totient is φ = 7069008.

The previous prime is 21416167. The next prime is 21416177. The reversal of 21416172 is 27161412.

It is an interprime number because it is at equal distance from previous prime (21416167) and next prime (21416177).

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21416177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7428 + ... + 9899.

It is an arithmetic number, because the mean of its divisors is an integer number (2102464).

Almost surely, 2^21416172 is an apocalyptic number.

It is an amenable number.

21416172 is an abundant number, since it is smaller than the sum of its proper divisors (29042964).

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

21416172 is a wasteful number, since it uses less digits than its factorization.

21416172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17437 (or 17435 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 21416172 is about 4627.7610137085. The cubic root of 21416172 is about 277.7030281119.

Adding to 21416172 its reverse (27161412), we get a palindrome (48577584).

The spelling of 21416172 in words is "twenty-one million, four hundred sixteen thousand, one hundred seventy-two".