2021222221100 has 72 divisors (see below), whose sum is σ = 4660046112960. Its totient is φ = 758778477120.

The previous prime is 2021222221003. The next prime is 2021222221103. The reversal of 2021222221100 is 11222221202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2021222221103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4767734 + ... + 5174333.

It is an arithmetic number, because the mean of its divisors is an integer number (64722862680).

Almost surely, 2^{2021222221100} is an apocalyptic number.

2021222221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021222221100 is an abundant number, since it is smaller than the sum of its proper divisors (2638823891860).

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

2021222221100 is a wasteful number, since it uses less digits than its factorization.

2021222221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9942207 (or 9942200 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2021222221100 its reverse (11222221202), we get a palindrome (2032444442302).

The spelling of 2021222221100 in words is "two trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred".