1221111110222 has 4 divisors (see below), whose sum is σ = 1831666665336. Its totient is φ = 610555555110.

The previous prime is 1221111110209. The next prime is 1221111110231. The reversal of 1221111110222 is 2220111111221.

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

It is a super-2 number, since 2×1221111110222² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221111110222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305277777554 + ... + 305277777557.

It is an arithmetic number, because the mean of its divisors is an integer number (457916666334).

Almost surely, 2^{1221111110222} is an apocalyptic number.

1221111110222 is a deficient number, since it is larger than the sum of its proper divisors (610555555114).

1221111110222 is an equidigital number, since it uses as much as digits as its factorization.

1221111110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610555555113.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221111110222 its reverse (2220111111221), we get a palindrome (3441222221443).

Subtracting 1221111110222 from its reverse (2220111111221), we obtain a palindrome (999000000999).

The spelling of 1221111110222 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred twenty-two".