21316152 has 64 divisors (see below), whose sum is σ = 62616960. Its totient is φ = 5961600.

The previous prime is 21316133. The next prime is 21316153. The reversal of 21316152 is 25161312.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21316153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (978390).

Almost surely, 2^21316152 is an apocalyptic number.

21316152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21316152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31308480).

21316152 is an abundant number, since it is smaller than the sum of its proper divisors (41300808).

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

21316152 is a wasteful number, since it uses less digits than its factorization.

21316152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244 (or 6240 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 21316152 is about 4616.9418449879. The cubic root of 21316152 is about 277.2700342983.

Adding to 21316152 its reverse (25161312), we get a palindrome (46477464).

The spelling of 21316152 in words is "twenty-one million, three hundred sixteen thousand, one hundred fifty-two".