1221100000222 has 4 divisors (see below), whose sum is σ = 1831650000336. Its totient is φ = 610550000110.

The previous prime is 1221100000217. The next prime is 1221100000229. The reversal of 1221100000222 is 2220000011221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100000229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305275000054 + ... + 305275000057.

It is an arithmetic number, because the mean of its divisors is an integer number (457912500084).

Almost surely, 2^{1221100000222} is an apocalyptic number.

1221100000222 is a deficient number, since it is larger than the sum of its proper divisors (610550000114).

1221100000222 is an equidigital number, since it uses as much as digits as its factorization.

1221100000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610550000113.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221100000222 its reverse (2220000011221), we get a palindrome (3441100011443).

The spelling of 1221100000222 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty-two", and thus it is an aban number.