1221001212222 has 24 divisors (see below), whose sum is σ = 2886002865720. Its totient is φ = 370000367280.

The previous prime is 1221001212181. The next prime is 1221001212239. The reversal of 1221001212222 is 2222121001221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221001212195 and 1221001212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3083336197 + ... + 3083336592.

It is an arithmetic number, because the mean of its divisors is an integer number (120250119405).

Almost surely, 2^{1221001212222} is an apocalyptic number.

1221001212222 is an abundant number, since it is smaller than the sum of its proper divisors (1665001653498).

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

1221001212222 is a wasteful number, since it uses less digits than its factorization.

1221001212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6166672808 (or 6166672805 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221001212222 its reverse (2222121001221), we get a palindrome (3443122213443).

The spelling of 1221001212222 in words is "one trillion, two hundred twenty-one billion, one million, two hundred twelve thousand, two hundred twenty-two".