2101220220021 has 32 divisors (see below), whose sum is σ = 3203180386560. Its totient is φ = 1213733458944.

The previous prime is 2101220220017. The next prime is 2101220220023. The reversal of 2101220220021 is 1200220221012.

It is not a de Polignac number, because 2101220220021 - 2² = 2101220220017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220220023) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4001041 + ... + 4495638.

It is an arithmetic number, because the mean of its divisors is an integer number (100099387080).

Almost surely, 2^{2101220220021} is an apocalyptic number.

It is an amenable number.

2101220220021 is a deficient number, since it is larger than the sum of its proper divisors (1101960166539).

2101220220021 is a wasteful number, since it uses less digits than its factorization.

2101220220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8497085.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2101220220021 its reverse (1200220221012), we get a palindrome (3301440441033).

Subtracting from 2101220220021 its reverse (1200220221012), we obtain a palindrome (900999999009).

The spelling of 2101220220021 in words is "two trillion, one hundred one billion, two hundred twenty million, two hundred twenty thousand, twenty-one".