2101221101 has 32 divisors (see below), whose sum is σ = 2500776960. Its totient is φ = 1728324864.

The previous prime is 2101221047. The next prime is 2101221107. The reversal of 2101221101 is 1011221012.

It is not a de Polignac number, because 2101221101 - 2⁶ = 2101221037 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 (2101221107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5543930 + ... + 5544308.

It is an arithmetic number, because the mean of its divisors is an integer number (78149280).

Almost surely, 2^2101221101 is an apocalyptic number.

It is an amenable number.

2101221101 is a deficient number, since it is larger than the sum of its proper divisors (399555859).

2101221101 is a wasteful number, since it uses less digits than its factorization.

2101221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705.

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

The square root of 2101221101 is about 45839.0783175229. The cubic root of 2101221101 is about 1280.8273258619.

Adding to 2101221101 its reverse (1011221012), we get a palindrome (3112442113).

The spelling of 2101221101 in words is "two billion, one hundred one million, two hundred twenty-one thousand, one hundred one".