20212133220 has 72 divisors (see below), whose sum is σ = 61664626296. Its totient is φ = 5358738432.

The previous prime is 20212133167. The next prime is 20212133233. The reversal of 20212133220 is 2233121202.

It can be written as a sum of positive squares in 4 ways, for example, as 4105477476 + 16106655744 = 64074^2 + 126912^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20212133193 and 20212133202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 293397 + ... + 355676.

It is an arithmetic number, because the mean of its divisors is an integer number (856453143).

Almost surely, 2^20212133220 is an apocalyptic number.

20212133220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212133220 is an abundant number, since it is smaller than the sum of its proper divisors (41452493076).

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

20212133220 is a wasteful number, since it uses less digits than its factorization.

20212133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649261 (or 649256 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20212133220 its reverse (2233121202), we get a palindrome (22445254422).

The spelling of 20212133220 in words is "twenty billion, two hundred twelve million, one hundred thirty-three thousand, two hundred twenty".