2101220311 has 4 divisors (see below), whose sum is σ = 2120857992. Its totient is φ = 2081582632.

The previous prime is 2101220293. The next prime is 2101220369. The reversal of 2101220311 is 1130221012.

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 2101220311 - 2⁷ = 2101220183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101220291 and 2101220300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220411) 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, 9818680 + ... + 9818893.

It is an arithmetic number, because the mean of its divisors is an integer number (530214498).

Almost surely, 2^2101220311 is an apocalyptic number.

2101220311 is a deficient number, since it is larger than the sum of its proper divisors (19637681).

2101220311 is a wasteful number, since it uses less digits than its factorization.

2101220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19637680.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2101220311 is about 45839.0697004204. The cubic root of 2101220311 is about 1280.8271653435.

Adding to 2101220311 its reverse (1130221012), we get a palindrome (3231441323).

The spelling of 2101220311 in words is "two billion, one hundred one million, two hundred twenty thousand, three hundred eleven".