18106521 has 8 divisors (see below), whose sum is σ = 24225600. Its totient is φ = 12029232.

The previous prime is 18106519. The next prime is 18106523. The reversal of 18106521 is 12560181.

It is an interprime number because it is at equal distance from previous prime (18106519) and next prime (18106523).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18106521 - 2¹ = 18106519 is a prime.

It is a super-2 number, since 2×18106521² = 655692205446882, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18106491 and 18106500.

It is not an unprimeable number, because it can be changed into a prime (18106523) 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, 9421 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (3028200).

Almost surely, 2^18106521 is an apocalyptic number.

It is an amenable number.

18106521 is a deficient number, since it is larger than the sum of its proper divisors (6119079).

18106521 is a wasteful number, since it uses less digits than its factorization.

18106521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20895.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 18106521 is about 4255.1757895532. The cubic root of 18106521 is about 262.5900933383.

The spelling of 18106521 in words is "eighteen million, one hundred six thousand, five hundred twenty-one".