1221111122222 has 8 divisors (see below), whose sum is σ = 1890752705472. Its totient is φ = 590860220400.

The previous prime is 1221111122207. The next prime is 1221111122263. The reversal of 1221111122222 is 2222211111221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1221111122222² (a number of 25 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221111122194 and 1221111122203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9847670279 + ... + 9847670402.

It is an arithmetic number, because the mean of its divisors is an integer number (236344088184).

Almost surely, 2^{1221111122222} is an apocalyptic number.

1221111122222 is a deficient number, since it is larger than the sum of its proper divisors (669641583250).

1221111122222 is a wasteful number, since it uses less digits than its factorization.

1221111122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19695340714.

The product of its digits is 128, while the sum is 20.

Adding to 1221111122222 its reverse (2222211111221), we get a palindrome (3443322233443).

The spelling of 1221111122222 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-two".