1221002022212 has 96 divisors (see below), whose sum is σ = 2597196317184. Its totient is φ = 490913280000.

The previous prime is 1221002022209. The next prime is 1221002022241. The reversal of 1221002022212 is 2122202001221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136557662 + ... + 136566602.

It is an arithmetic number, because the mean of its divisors is an integer number (27054128304).

Almost surely, 2^{1221002022212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221002022212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1298598158592).

1221002022212 is an abundant number, since it is smaller than the sum of its proper divisors (1376194294972).

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

1221002022212 is a wasteful number, since it uses less digits than its factorization.

1221002022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13029 (or 13027 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221002022212 its reverse (2122202001221), we get a palindrome (3343204023433).

The spelling of 1221002022212 in words is "one trillion, two hundred twenty-one billion, two million, twenty-two thousand, two hundred twelve".