18521012 has 24 divisors (see below), whose sum is σ = 34282752. Its totient is φ = 8740800.

The previous prime is 18520993. The next prime is 18521021. The reversal of 18521012 is 21012581.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

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, 3263 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (1428448).

Almost surely, 2^18521012 is an apocalyptic number.

It is an amenable number.

18521012 is a deficient number, since it is larger than the sum of its proper divisors (15761740).

18521012 is a wasteful number, since it uses less digits than its factorization.

18521012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719 (or 3717 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18521012 is about 4303.6045357351. The cubic root of 18521012 is about 264.5787159272.

Adding to 18521012 its reverse (21012581), we get a palindrome (39533593).

The spelling of 18521012 in words is "eighteen million, five hundred twenty-one thousand, twelve".