2101001012221 has 4 divisors (see below), whose sum is σ = 2132359236352. Its totient is φ = 2069642788092.

The previous prime is 2101001012203. The next prime is 2101001012233. The reversal of 2101001012221 is 1222101001012.

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 2101001012221 - 2¹⁹ = 2101000487933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101001012281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15679111965 + ... + 15679112098.

It is an arithmetic number, because the mean of its divisors is an integer number (533089809088).

Almost surely, 2^{2101001012221} is an apocalyptic number.

It is an amenable number.

2101001012221 is a deficient number, since it is larger than the sum of its proper divisors (31358224131).

2101001012221 is an equidigital number, since it uses as much as digits as its factorization.

2101001012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31358224130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2101001012221 its reverse (1222101001012), we get a palindrome (3323102013233).

The spelling of 2101001012221 in words is "two trillion, one hundred one billion, one million, twelve thousand, two hundred twenty-one".