18521107 has 6 divisors (see below), whose sum is σ = 20358044. Its totient is φ = 16837260.

The previous prime is 18521101. The next prime is 18521117. The reversal of 18521107 is 70112581.

It is not a de Polignac number, because 18521107 - 2¹⁵ = 18488339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18521101) 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, 76413 + ... + 76654.

Almost surely, 2^18521107 is an apocalyptic number.

18521107 is a deficient number, since it is larger than the sum of its proper divisors (1836937).

18521107 is a wasteful number, since it uses less digits than its factorization.

18521107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153089 (or 153078 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 18521107 is about 4303.6155729805. The cubic root of 18521107 is about 264.5791682951.

Adding to 18521107 its reverse (70112581), we get a palindrome (88633688).

It can be divided in two parts, 18 and 521107, that added together give a palindrome (521125).

The spelling of 18521107 in words is "eighteen million, five hundred twenty-one thousand, one hundred seven".