2101511223 has 20 divisors (see below), whose sum is σ = 3587766160. Its totient is φ = 1200863232.

The previous prime is 2101511221. The next prime is 2101511239. The reversal of 2101511223 is 3221151012.

It is not a de Polignac number, because 2101511223 - 2¹ = 2101511221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101511196 and 2101511205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101511221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1852618 + ... + 1853751.

It is an arithmetic number, because the mean of its divisors is an integer number (179388308).

Almost surely, 2^2101511223 is an apocalyptic number.

2101511223 is a deficient number, since it is larger than the sum of its proper divisors (1486254937).

2101511223 is an equidigital number, since it uses as much as digits as its factorization.

2101511223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706388 (or 3706379 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 2101511223 is about 45842.2427789043. The cubic root of 2101511223 is about 1280.8862723929.

Adding to 2101511223 its reverse (3221151012), we get a palindrome (5322662235).

The spelling of 2101511223 in words is "two billion, one hundred one million, five hundred eleven thousand, two hundred twenty-three".