221121222212 has 24 divisors (see below), whose sum is σ = 435757953792. Its totient is φ = 97267399200.

The previous prime is 221121222173. The next prime is 221121222221. The reversal of 221121222212 is 212222121122.

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, 81054803 + ... + 81057530.

It is an arithmetic number, because the mean of its divisors is an integer number (18156581408).

Almost surely, 2^221121222212 is an apocalyptic number.

221121222212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221121222212 is a deficient number, since it is larger than the sum of its proper divisors (214636731580).

221121222212 is a wasteful number, since it uses less digits than its factorization.

221121222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162112379 (or 162112377 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 221121222212 its reverse (212222121122), we get a palindrome (433343343334).

The spelling of 221121222212 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".