2101123220 has 24 divisors (see below), whose sum is σ = 5042696064. Its totient is φ = 720385056.

The previous prime is 2101123207. The next prime is 2101123231. The reversal of 2101123220 is 223211012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2101123195 and 2101123204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7503872 + ... + 7504151.

It is an arithmetic number, because the mean of its divisors is an integer number (210112336).

Almost surely, 2^2101123220 is an apocalyptic number.

2101123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101123220 is an abundant number, since it is smaller than the sum of its proper divisors (2941572844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101123220 is a wasteful number, since it uses less digits than its factorization.

2101123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15008039 (or 15008037 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2101123220 is about 45838.0106461875. The cubic root of 2101123220 is about 1280.8074373304.

Adding to 2101123220 its reverse (223211012), we get a palindrome (2324334232).

The spelling of 2101123220 in words is "two billion, one hundred one million, one hundred twenty-three thousand, two hundred twenty".