21516292 has 36 divisors (see below), whose sum is σ = 44151744. Its totient is φ = 9147600.

The previous prime is 21516281. The next prime is 21516301. The reversal of 21516292 is 29261512.

It is a Harshad number since it is a multiple of its sum of digits (28).

21516292 is a Rhonda number in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 21516292.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29233 + ... + 29959.

Almost surely, 2^21516292 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 21516292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22075872).

21516292 is an abundant number, since it is smaller than the sum of its proper divisors (22635452).

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

21516292 is a wasteful number, since it uses less digits than its factorization.

21516292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896 (or 887 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 21516292 is about 4638.5657266013. The cubic root of 21516292 is about 278.1351067657.

The spelling of 21516292 in words is "twenty-one million, five hundred sixteen thousand, two hundred ninety-two".