2101220200021 has 16 divisors (see below), whose sum is σ = 2164097479104. Its totient is φ = 2038983657984.

The previous prime is 2101220199997. The next prime is 2101220200039. The reversal of 2101220200021 is 1200020221012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2101220200021 - 2⁵ = 2101220199989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101220199974 and 2101220200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220200081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56440005 + ... + 56477221.

It is an arithmetic number, because the mean of its divisors is an integer number (135256092444).

Almost surely, 2^{2101220200021} is an apocalyptic number.

It is an amenable number.

2101220200021 is a deficient number, since it is larger than the sum of its proper divisors (62877279083).

2101220200021 is a wasteful number, since it uses less digits than its factorization.

2101220200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45780.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2101220200021 its reverse (1200020221012), we get a palindrome (3301240421033).

The spelling of 2101220200021 in words is "two trillion, one hundred one billion, two hundred twenty million, two hundred thousand, twenty-one".