2021022221000 has 128 divisors (see below), whose sum is σ = 4806473873760. Its totient is φ = 795300480000.

The previous prime is 2021022220991. The next prime is 2021022221021. The reversal of 2021022221000 is 1222201202.

It can be written as a sum of positive squares in 16 ways, for example, as 251648709316 + 1769373511684 = 501646^2 + 1330178^2 .

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, 15793274 + ... + 15920726.

Almost surely, 2^{2021022221000} is an apocalyptic number.

2021022221000 is a gapful number since it is divisible by the number (20) 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 2021022221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2403236936880).

2021022221000 is an abundant number, since it is smaller than the sum of its proper divisors (2785451652760).

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

2021022221000 is a wasteful number, since it uses less digits than its factorization.

2021022221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127732 (or 127718 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2021022221000 its reverse (1222201202), we get a palindrome (2022244422202).

The spelling of 2021022221000 in words is "two trillion, twenty-one billion, twenty-two million, two hundred twenty-one thousand".