21302118 has 12 divisors (see below), whose sum is σ = 46154628. Its totient is φ = 7100700.

The previous prime is 21302111. The next prime is 21302123. The reversal of 21302118 is 81120312.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1183451 = 21302118 / (2 + 1 + 3 + 0 + 2 + 1 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 21302118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 591708 + ... + 591743.

It is an arithmetic number, because the mean of its divisors is an integer number (3846219).

Almost surely, 2^21302118 is an apocalyptic number.

21302118 is an abundant number, since it is smaller than the sum of its proper divisors (24852510).

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

21302118 is a wasteful number, since it uses less digits than its factorization.

21302118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183459 (or 1183456 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 21302118 is about 4615.4217575429. The cubic root of 21302118 is about 277.2091718135.

The spelling of 21302118 in words is "twenty-one million, three hundred two thousand, one hundred eighteen".