1221000222112 has 48 divisors (see below), whose sum is σ = 2623035895200. Its totient is φ = 554860330240.

The previous prime is 1221000222031. The next prime is 1221000222131. The reversal of 1221000222112 is 2112220001221.

It is a happy number.

It is a super-3 number, since 3×1221000222112³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 969339 + ... + 1838917.

It is an arithmetic number, because the mean of its divisors is an integer number (54646581150).

Almost surely, 2^{1221000222112} is an apocalyptic number.

It is an amenable number.

1221000222112 is an abundant number, since it is smaller than the sum of its proper divisors (1402035673088).

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

1221000222112 is a wasteful number, since it uses less digits than its factorization.

1221000222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873589 (or 873581 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221000222112 its reverse (2112220001221), we get a palindrome (3333220223333).

The spelling of 1221000222112 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two thousand, one hundred twelve".