2101220011 has 4 divisors (see below), whose sum is σ = 2292240024. Its totient is φ = 1910200000.

The previous prime is 2101220003. The next prime is 2101220057. The reversal of 2101220011 is 1100221012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101220011 - 2³ = 2101220003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101220011.

It is not an unprimeable number, because it can be changed into a prime (2101220081) 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, 95509990 + ... + 95510011.

It is an arithmetic number, because the mean of its divisors is an integer number (573060006).

Almost surely, 2^2101220011 is an apocalyptic number.

2101220011 is a deficient number, since it is larger than the sum of its proper divisors (191020013).

2101220011 is a wasteful number, since it uses less digits than its factorization.

2101220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191020012.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2101220011 is about 45839.0664281026. The cubic root of 2101220011 is about 1280.8271043872.

Adding to 2101220011 its reverse (1100221012), we get a palindrome (3201441023).

It can be divided in two parts, 210 and 1220011, that added together give a palindrome (1220221).

The spelling of 2101220011 in words is "two billion, one hundred one million, two hundred twenty thousand, eleven".