21915282 has 8 divisors (see below), whose sum is σ = 43830576. Its totient is φ = 7305092.

The previous prime is 21915277. The next prime is 21915293. The reversal of 21915282 is 28251912.

It is a sphenic number, since it is the product of 3 distinct primes.

21915282 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826268 + ... + 1826279.

It is an arithmetic number, because the mean of its divisors is an integer number (5478822).

Almost surely, 2^21915282 is an apocalyptic number.

21915282 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21915282 is a wasteful number, since it uses less digits than its factorization.

21915282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652552.

The product of its digits is 2880, while the sum is 30.

The square root of 21915282 is about 4681.3760797441. The cubic root of 21915282 is about 279.8437989321.

The spelling of 21915282 in words is "twenty-one million, nine hundred fifteen thousand, two hundred eighty-two".