21982488 has 32 divisors (see below), whose sum is σ = 59952960. Its totient is φ = 6661280.

The previous prime is 21982481. The next prime is 21982489. The reversal of 21982488 is 88428912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982481) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41370 + ... + 41897.

It is an arithmetic number, because the mean of its divisors is an integer number (1873530).

Almost surely, 2^21982488 is an apocalyptic number.

It is an amenable number.

21982488 is an abundant number, since it is smaller than the sum of its proper divisors (37970472).

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

21982488 is a wasteful number, since it uses less digits than its factorization.

21982488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83287 (or 83283 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 21982488 is about 4688.5486027128. The cubic root of 21982488 is about 280.1295658864.

It can be divided in two parts, 219824 and 88, that added together give a palindrome (219912).

The spelling of 21982488 in words is "twenty-one million, nine hundred eighty-two thousand, four hundred eighty-eight".