2021001222222 has 96 divisors (see below), whose sum is σ = 4544083514880. Its totient is φ = 648393721920.

The previous prime is 2021001222221. The next prime is 2021001222223. The reversal of 2021001222222 is 2222221001202.

It is an interprime number because it is at equal distance from previous prime (2021001222221) and next prime (2021001222223).

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 = 2021001222195 and 2021001222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021001222221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254947623 + ... + 254955549.

It is an arithmetic number, because the mean of its divisors is an integer number (47334203280).

Almost surely, 2^{2021001222222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021001222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2272041757440).

2021001222222 is an abundant number, since it is smaller than the sum of its proper divisors (2523082292658).

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

2021001222222 is a wasteful number, since it uses less digits than its factorization.

2021001222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9438 (or 9435 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 2021001222222 its reverse (2222221001202), we get a palindrome (4243222223424).

The spelling of 2021001222222 in words is "two trillion, twenty-one billion, one million, two hundred twenty-two thousand, two hundred twenty-two".