21516192 has 72 divisors (see below), whose sum is σ = 63475776. Its totient is φ = 7169472.

The previous prime is 21516191. The next prime is 21516193. The reversal of 21516192 is 29161512.

It is an interprime number because it is at equal distance from previous prime (21516191) and next prime (21516193).

It is a tau number, because it is divible by the number of its divisors (72).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21516191) 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, 6393 + ... + 9159.

It is an arithmetic number, because the mean of its divisors is an integer number (881608).

Almost surely, 2^21516192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21516192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31737888).

21516192 is an abundant number, since it is smaller than the sum of its proper divisors (41959584).

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

21516192 is an equidigital number, since it uses as much as digits as its factorization.

21516192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792 (or 2772 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 21516192 is about 4638.5549473947. The cubic root of 21516192 is about 278.1346758743.

The spelling of 21516192 in words is "twenty-one million, five hundred sixteen thousand, one hundred ninety-two".