1221022102212 has 144 divisors (see below), whose sum is σ = 3456138067200. Its totient is φ = 360335263680.

The previous prime is 1221022102171. The next prime is 1221022102229. The reversal of 1221022102212 is 2122012201221.

It is a happy number.

1221022102212 is a `hidden beast` number, since 1 + 221 + 0 + 221 + 0 + 221 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2255739 + ... + 2744157.

It is an arithmetic number, because the mean of its divisors is an integer number (24000958800).

Almost surely, 2^{1221022102212} is an apocalyptic number.

1221022102212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221022102212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1728069033600).

1221022102212 is an abundant number, since it is smaller than the sum of its proper divisors (2235115964988).

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

1221022102212 is a wasteful number, since it uses less digits than its factorization.

1221022102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488606 (or 488601 counting only the distinct ones).

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

Adding to 1221022102212 its reverse (2122012201221), we get a palindrome (3343034303433).

Subtracting 1221022102212 from its reverse (2122012201221), we obtain a palindrome (900990099009).

The spelling of 1221022102212 in words is "one trillion, two hundred twenty-one billion, twenty-two million, one hundred two thousand, two hundred twelve".