212021321100 has 72 divisors (see below), whose sum is σ = 645735128640. Its totient is φ = 53563279680.

The previous prime is 212021321093. The next prime is 212021321111. The reversal of 212021321100 is 1123120212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212021321100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18592662 + ... + 18604061.

Almost surely, 2^212021321100 is an apocalyptic number.

212021321100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021321100 is an abundant number, since it is smaller than the sum of its proper divisors (433713807540).

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

212021321100 is a wasteful number, since it uses less digits than its factorization.

212021321100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37196759 (or 37196752 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 212021321100 its reverse (1123120212), we get a palindrome (213144441312).

The spelling of 212021321100 in words is "two hundred twelve billion, twenty-one million, three hundred twenty-one thousand, one hundred".