21018882 has 8 divisors (see below), whose sum is σ = 42037776. Its totient is φ = 7006292.

The previous prime is 21018869. The next prime is 21018929. The reversal of 21018882 is 28881012.

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

21018882 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, 1751568 + ... + 1751579.

It is an arithmetic number, because the mean of its divisors is an integer number (5254722).

Almost surely, 2^21018882 is an apocalyptic number.

21018882 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.

21018882 is a wasteful number, since it uses less digits than its factorization.

21018882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503152.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 21018882 is about 4584.6354271632. The cubic root of 21018882 is about 275.9750817663.

Adding to 21018882 its reverse (28881012), we get a palindrome (49899894).

The spelling of 21018882 in words is "twenty-one million, eighteen thousand, eight hundred eighty-two".