18201920212 has 24 divisors (see below), whose sum is σ = 36406843200. Its totient is φ = 7800179520.

The previous prime is 18201920207. The next prime is 18201920237. The reversal of 18201920212 is 21202910281.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 501039 + ... + 536137.

It is an arithmetic number, because the mean of its divisors is an integer number (1516951800).

Almost surely, 2^18201920212 is an apocalyptic number.

It is an amenable number.

18201920212 is an abundant number, since it is smaller than the sum of its proper divisors (18204922988).

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

18201920212 is a wasteful number, since it uses less digits than its factorization.

18201920212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53631 (or 53629 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 18201920212 in words is "eighteen billion, two hundred one million, nine hundred twenty thousand, two hundred twelve".