21918102 has 16 divisors (see below), whose sum is σ = 43945392. Its totient is φ = 7287840.

The previous prime is 21918101. The next prime is 21918107. The reversal of 21918102 is 20181912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21918101) 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, 1813 + ... + 6864.

It is an arithmetic number, because the mean of its divisors is an integer number (2746587).

Almost surely, 2^21918102 is an apocalyptic number.

21918102 is an abundant number, since it is smaller than the sum of its proper divisors (22027290).

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

21918102 is a wasteful number, since it uses less digits than its factorization.

21918102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9103.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 21918102 is about 4681.6772635456. The cubic root of 21918102 is about 279.8558016017.

The spelling of 21918102 in words is "twenty-one million, nine hundred eighteen thousand, one hundred two".