18211284252 has 54 divisors (see below), whose sum is σ = 52616566184. Its totient is φ = 5202612000.

The previous prime is 18211284239. The next prime is 18211284257. The reversal of 18211284252 is 25248211281.

It is a happy number.

18211284252 is a `hidden beast` number, since 18 + 211 + 2 + 8 + 425 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211284257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2138002 + ... + 2146502.

Almost surely, 2^18211284252 is an apocalyptic number.

18211284252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18211284252 is an abundant number, since it is smaller than the sum of its proper divisors (34405281932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18211284252 is an frugal number, since it uses more digits than its factorization.

18211284252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17019 (or 8513 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The spelling of 18211284252 in words is "eighteen billion, two hundred eleven million, two hundred eighty-four thousand, two hundred fifty-two".