18212003136 has 42 divisors (see below), whose sum is σ = 52201420362. Its totient is φ = 6070667520.

The previous prime is 18212003111. The next prime is 18212003143. The reversal of 18212003136 is 63130021281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15611003136 + 2601000000 = 124944^2 + 51000^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15808455 + ... + 15809606.

It is an arithmetic number, because the mean of its divisors is an integer number (1242890961).

Almost surely, 2^18212003136 is an apocalyptic number.

18212003136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18212003136 is an abundant number, since it is smaller than the sum of its proper divisors (33989417226).

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

18212003136 is a wasteful number, since it uses less digits than its factorization.

18212003136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31618079 (or 31618066 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 18212003136 in words is "eighteen billion, two hundred twelve million, three thousand, one hundred thirty-six".