2101210022221 has 4 divisors (see below), whose sum is σ = 2101756220512. Its totient is φ = 2100663823932.

The previous prime is 2101210022207. The next prime is 2101210022341. The reversal of 2101210022221 is 1222200121012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101210022221 - 2⁵ = 2101210022189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101210022195 and 2101210022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101210028221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273093375 + ... + 273101068.

It is an arithmetic number, because the mean of its divisors is an integer number (525439055128).

Almost surely, 2^{2101210022221} is an apocalyptic number.

It is an amenable number.

2101210022221 is a deficient number, since it is larger than the sum of its proper divisors (546198291).

2101210022221 is an equidigital number, since it uses as much as digits as its factorization.

2101210022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546198290.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2101210022221 its reverse (1222200121012), we get a palindrome (3323410143233).

The spelling of 2101210022221 in words is "two trillion, one hundred one billion, two hundred ten million, twenty-two thousand, two hundred twenty-one".