221131111111212 has 24 divisors (see below), whose sum is σ = 515973197892096. Its totient is φ = 73710283899088.

The previous prime is 221131111111201. The next prime is 221131111111231. The reversal of 221131111111212 is 212111111131122.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303373 + ... + 21032219.

It is an arithmetic number, because the mean of its divisors is an integer number (21498883245504).

Almost surely, 2^{221131111111212} is an apocalyptic number.

It is an amenable number.

221131111111212 is an abundant number, since it is smaller than the sum of its proper divisors (294842086780884).

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

221131111111212 is a wasteful number, since it uses less digits than its factorization.

221131111111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21617837 (or 21617835 counting only the distinct ones).

The product of its digits is 48, while the sum is 21.

Adding to 221131111111212 its reverse (212111111131122), we get a palindrome (433242222242334).

The spelling of 221131111111212 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred twelve".