2101101221 has 4 divisors (see below), whose sum is σ = 2192453472. Its totient is φ = 2009748972.

The previous prime is 2101101181. The next prime is 2101101227. The reversal of 2101101221 is 1221011012.

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 2101101221 - 2⁶ = 2101101157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101101227) 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, 45676091 + ... + 45676136.

It is an arithmetic number, because the mean of its divisors is an integer number (548113368).

Almost surely, 2^2101101221 is an apocalyptic number.

It is an amenable number.

2101101221 is a deficient number, since it is larger than the sum of its proper divisors (91352251).

2101101221 is an equidigital number, since it uses as much as digits as its factorization.

2101101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91352250.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2101101221 is about 45837.7706809570. The cubic root of 2101101221 is about 1280.8029672481.

Adding to 2101101221 its reverse (1221011012), we get a palindrome (3322112233).

The spelling of 2101101221 in words is "two billion, one hundred one million, one hundred one thousand, two hundred twenty-one".