21150318 has 32 divisors (see below), whose sum is σ = 48496896. Its totient is φ = 6023808.

The previous prime is 21150313. The next prime is 21150331. The reversal of 21150318 is 81305112.

It is a super-2 number, since 2×21150318² = 894671903002248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21150294 and 21150303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150313) 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 15 ways as a sum of consecutive naturals, for example, 17605 + ... + 18767.

It is an arithmetic number, because the mean of its divisors is an integer number (1515528).

Almost surely, 2^21150318 is an apocalyptic number.

21150318 is an abundant number, since it is smaller than the sum of its proper divisors (27346578).

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

21150318 is a wasteful number, since it uses less digits than its factorization.

21150318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 21150318 is about 4598.9474882847. The cubic root of 21150318 is about 276.5491325085.

The spelling of 21150318 in words is "twenty-one million, one hundred fifty thousand, three hundred eighteen".