21882506 has 8 divisors (see below), whose sum is σ = 32863584. Its totient is φ = 10927980.

The previous prime is 21882493. The next prime is 21882517. The reversal of 21882506 is 60528812.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4430 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (4107948).

Almost surely, 2^21882506 is an apocalyptic number.

21882506 is a deficient number, since it is larger than the sum of its proper divisors (10981078).

21882506 is a wasteful number, since it uses less digits than its factorization.

21882506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13276.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 21882506 is about 4677.8740897976. The cubic root of 21882506 is about 279.7042199736.

The spelling of 21882506 in words is "twenty-one million, eight hundred eighty-two thousand, five hundred six".