18235021 has 16 divisors (see below), whose sum is σ = 22166784. Its totient is φ = 14661504.

The previous prime is 18234977. The next prime is 18235027. The reversal of 18235021 is 12053281.

It is a cyclic number.

It is not a de Polignac number, because 18235021 - 2⁷ = 18234893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18234983 and 18235001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18235027) 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, 7465 + ... + 9601.

It is an arithmetic number, because the mean of its divisors is an integer number (1385424).

Almost surely, 2^18235021 is an apocalyptic number.

It is an amenable number.

18235021 is a deficient number, since it is larger than the sum of its proper divisors (3931763).

18235021 is a wasteful number, since it uses less digits than its factorization.

18235021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18235021 is about 4270.2483534333. The cubic root of 18235021 is about 263.2098206579.

The spelling of 18235021 in words is "eighteen million, two hundred thirty-five thousand, twenty-one".