18021310 has 16 divisors (see below), whose sum is σ = 34146000. Its totient is φ = 6829056.

The previous prime is 18021307. The next prime is 18021319. The reversal of 18021310 is 1312081.

It is a super-2 number, since 2×18021310² = 649535228232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47235 + ... + 47614.

It is an arithmetic number, because the mean of its divisors is an integer number (2134125).

Almost surely, 2^18021310 is an apocalyptic number.

18021310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18021310 is a deficient number, since it is larger than the sum of its proper divisors (16124690).

18021310 is a wasteful number, since it uses less digits than its factorization.

18021310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94875.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 18021310 is about 4245.1513518366. The cubic root of 18021310 is about 262.1775208548.

Adding to 18021310 its reverse (1312081), we get a palindrome (19333391).

The spelling of 18021310 in words is "eighteen million, twenty-one thousand, three hundred ten".