1221210222112 has 48 divisors (see below), whose sum is σ = 2449890696960. Its totient is φ = 599018298112.

The previous prime is 1221210222103. The next prime is 1221210222203. The reversal of 1221210222112 is 2112220121221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221210222112.

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, 17710839 + ... + 17779657.

It is an arithmetic number, because the mean of its divisors is an integer number (51039389520).

Almost surely, 2^{1221210222112} is an apocalyptic number.

It is an amenable number.

1221210222112 is an abundant number, since it is smaller than the sum of its proper divisors (1228680474848).

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

1221210222112 is a wasteful number, since it uses less digits than its factorization.

1221210222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79345 (or 79337 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221210222112 its reverse (2112220121221), we get a palindrome (3333430343333).

The spelling of 1221210222112 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-two thousand, one hundred twelve".