221200021212 has 24 divisors (see below), whose sum is σ = 516642920976. Its totient is φ = 73660549248.

The previous prime is 221200021199. The next prime is 221200021213. The reversal of 221200021212 is 212120002122.

It is a junction number, because it is equal to n+sod(n) for n = 221200021191 and 221200021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9086233 + ... + 9110544.

It is an arithmetic number, because the mean of its divisors is an integer number (21526788374).

Almost surely, 2^221200021212 is an apocalyptic number.

It is an amenable number.

221200021212 is an abundant number, since it is smaller than the sum of its proper divisors (295442899764).

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

221200021212 is a wasteful number, since it uses less digits than its factorization.

221200021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18197797 (or 18197795 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221200021212 its reverse (212120002122), we get a palindrome (433320023334).

The spelling of 221200021212 in words is "two hundred twenty-one billion, two hundred million, twenty-one thousand, two hundred twelve".