2021111211222 has 80 divisors (see below), whose sum is σ = 4595946600960. Its totient is φ = 663749519472.

The previous prime is 2021111211211. The next prime is 2021111211253. The reversal of 2021111211222 is 2221121111202.

2021111211222 is a `hidden beast` number, since 20 + 211 + 1 + 1 + 211 + 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 = 2021111211195 and 2021111211204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5807583 + ... + 6145749.

It is an arithmetic number, because the mean of its divisors is an integer number (57449332512).

Almost surely, 2^{2021111211222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021111211222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2297973300480).

2021111211222 is an abundant number, since it is smaller than the sum of its proper divisors (2574835389738).

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

2021111211222 is a wasteful number, since it uses less digits than its factorization.

2021111211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338727 (or 338718 counting only the distinct ones).

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

Adding to 2021111211222 its reverse (2221121111202), we get a palindrome (4242232322424).

The spelling of 2021111211222 in words is "two trillion, twenty-one billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-two".