212121000221100 has 72 divisors (see below), whose sum is σ = 616852175840208. Its totient is φ = 56278465017600.

The previous prime is 212121000221063. The next prime is 212121000221177. The reversal of 212121000221100 is 1122000121212.

It is a super-3 number, since 3×212121000221100³ (a number of 44 digits) contains 333 as substring.

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 212121000221100.

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, 1794534811 + ... + 1794653010.

It is an arithmetic number, because the mean of its divisors is an integer number (8567391331114).

Almost surely, 2^{212121000221100} is an apocalyptic number.

212121000221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121000221100 is an abundant number, since it is smaller than the sum of its proper divisors (404731175619108).

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

212121000221100 is a wasteful number, since it uses less digits than its factorization.

212121000221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589188035 (or 3589188028 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212121000221100 its reverse (1122000121212), we get a palindrome (213243000342312).

The spelling of 212121000221100 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty-one thousand, one hundred".