2102021220 has 48 divisors (see below), whose sum is σ = 6338404800. Its totient is φ = 517420416.

The previous prime is 2102021209. The next prime is 2102021227. The reversal of 2102021220 is 221202012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2102021196 and 2102021205.

It is not an unprimeable number, because it can be changed into a prime (2102021227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1346670 + ... + 1348229.

It is an arithmetic number, because the mean of its divisors is an integer number (132050100).

Almost surely, 2^2102021220 is an apocalyptic number.

2102021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102021220 is an abundant number, since it is smaller than the sum of its proper divisors (4236383580).

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

2102021220 is a wasteful number, since it uses less digits than its factorization.

2102021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694924 (or 2694922 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2102021220 is about 45847.8049638148. The cubic root of 2102021220 is about 1280.9898796308.

Adding to 2102021220 its reverse (221202012), we get a palindrome (2323223232).

The spelling of 2102021220 in words is "two billion, one hundred two million, twenty-one thousand, two hundred twenty".