21982875 has 48 divisors (see below), whose sum is σ = 38417184. Its totient is φ = 11160000.

The previous prime is 21982861. The next prime is 21982879. The reversal of 21982875 is 57828912.

It is not a de Polignac number, because 21982875 - 2⁵ = 21982843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982879) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 360345 + ... + 360405.

It is an arithmetic number, because the mean of its divisors is an integer number (800358).

Almost surely, 2^21982875 is an apocalyptic number.

21982875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21982875 is a deficient number, since it is larger than the sum of its proper divisors (16434309).

21982875 is an equidigital number, since it uses as much as digits as its factorization.

21982875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 100 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 21982875 is about 4688.5898732988. The cubic root of 21982875 is about 280.1312097632.

The spelling of 21982875 in words is "twenty-one million, nine hundred eighty-two thousand, eight hundred seventy-five".