1021221111222 has 96 divisors (see below), whose sum is σ = 2520868896000. Its totient is φ = 296187731136.

The previous prime is 1021221111199. The next prime is 1021221111269. The reversal of 1021221111222 is 2221111221201.

1021221111222 is a `hidden beast` number, since 10 + 212 + 211 + 11 + 222 = 666.

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 = 1021221111195 and 1021221111204.

It is a congruent number.

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, 307633 + ... + 1461875.

It is an arithmetic number, because the mean of its divisors is an integer number (26259051000).

Almost surely, 2^{1021221111222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021221111222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260434448000).

1021221111222 is an abundant number, since it is smaller than the sum of its proper divisors (1499647784778).

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

1021221111222 is a wasteful number, since it uses less digits than its factorization.

1021221111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154482 (or 1154479 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1021221111222 its reverse (2221111221201), we get a palindrome (3242332332423).

The spelling of 1021221111222 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-two".