2121334220 has 24 divisors (see below), whose sum is σ = 4456385808. Its totient is φ = 848232000.

The previous prime is 2121334199. The next prime is 2121334223. The reversal of 2121334220 is 224331212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2121334192 and 2121334201.

It is not an unprimeable number, because it can be changed into a prime (2121334223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43895 + ... + 78545.

It is an arithmetic number, because the mean of its divisors is an integer number (185682742).

Almost surely, 2^2121334220 is an apocalyptic number.

2121334220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121334220 is an abundant number, since it is smaller than the sum of its proper divisors (2335051588).

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

2121334220 is a wasteful number, since it uses less digits than its factorization.

2121334220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37721 (or 37719 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2121334220 is about 46057.9441573329. The cubic root of 2121334220 is about 1284.9010951043.

Adding to 2121334220 its reverse (224331212), we get a palindrome (2345665432).

The spelling of 2121334220 in words is "two billion, one hundred twenty-one million, three hundred thirty-four thousand, two hundred twenty".