221210011212 has 24 divisors (see below), whose sum is σ = 516741266496. Its totient is φ = 73653159888.

The previous prime is 221210011189. The next prime is 221210011213. The reversal of 221210011212 is 212110012122.

It is a junction number, because it is equal to n+sod(n) for n = 221210011191 and 221210011200.

It is not an unprimeable number, because it can be changed into a prime (221210011213) 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, 10427778 + ... + 10448969.

It is an arithmetic number, because the mean of its divisors is an integer number (21530886104).

Almost surely, 2^221210011212 is an apocalyptic number.

It is an amenable number.

221210011212 is an abundant number, since it is smaller than the sum of its proper divisors (295531255284).

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

221210011212 is a wasteful number, since it uses less digits than its factorization.

221210011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20877637 (or 20877635 counting only the distinct ones).

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

Adding to 221210011212 its reverse (212110012122), we get a palindrome (433320023334).

The spelling of 221210011212 in words is "two hundred twenty-one billion, two hundred ten million, eleven thousand, two hundred twelve".