21416868 has 36 divisors (see below), whose sum is σ = 59059728. Its totient is φ = 6489840.

The previous prime is 21416867. The next prime is 21416869. The reversal of 21416868 is 86861412.

It is an interprime number because it is at equal distance from previous prime (21416867) and next prime (21416869).

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21416867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26646 + ... + 27437.

It is an arithmetic number, because the mean of its divisors is an integer number (1640548).

Almost surely, 2^21416868 is an apocalyptic number.

It is an amenable number.

21416868 is an abundant number, since it is smaller than the sum of its proper divisors (37642860).

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

21416868 is a wasteful number, since it uses less digits than its factorization.

21416868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54104 (or 54099 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 21416868 is about 4627.8362114491. The cubic root of 21416868 is about 277.7060364182.

It can be divided in two parts, 2141 and 6868, that added together give a palindrome (9009).

The spelling of 21416868 in words is "twenty-one million, four hundred sixteen thousand, eight hundred sixty-eight".