2101213220 has 24 divisors (see below), whose sum is σ = 4413522624. Its totient is φ = 840299616.

The previous prime is 2101213123. The next prime is 2101213237. The reversal of 2101213220 is 223121012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2101213195 and 2101213204.

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, 114737 + ... + 131783.

It is an arithmetic number, because the mean of its divisors is an integer number (183896776).

Almost surely, 2^2101213220 is an apocalyptic number.

2101213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101213220 is an abundant number, since it is smaller than the sum of its proper divisors (2312309404).

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

2101213220 is a wasteful number, since it uses less digits than its factorization.

2101213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23219 (or 23217 counting only the distinct ones).

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

The square root of 2101213220 is about 45838.9923536720. The cubic root of 2101213220 is about 1280.8257245370.

Adding to 2101213220 its reverse (223121012), we get a palindrome (2324334232).

The spelling of 2101213220 in words is "two billion, one hundred one million, two hundred thirteen thousand, two hundred twenty".