2121331220 has 48 divisors (see below), whose sum is σ = 4534299840. Its totient is φ = 833462784.

The previous prime is 2121331207. The next prime is 2121331241. The reversal of 2121331220 is 221331212.

It is a super-2 number, since 2×2121331220² = 9000092289893376800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505772 + ... + 509948.

It is an arithmetic number, because the mean of its divisors is an integer number (94464580).

Almost surely, 2^2121331220 is an apocalyptic number.

2121331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121331220 is an abundant number, since it is smaller than the sum of its proper divisors (2412968620).

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

2121331220 is a wasteful number, since it uses less digits than its factorization.

2121331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632 (or 4630 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2121331220 is about 46057.9115896498. The cubic root of 2121331220 is about 1284.9004893998.

Adding to 2121331220 its reverse (221331212), we get a palindrome (2342662432).

The spelling of 2121331220 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty".