2012121320 has 64 divisors (see below), whose sum is σ = 4962479040. Its totient is φ = 728179200.

The previous prime is 2012121313. The next prime is 2012121323. The reversal of 2012121320 is 231212102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2012121295 and 2012121304.

It is not an unprimeable number, because it can be changed into a prime (2012121323) 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, 82004 + ... + 103676.

It is an arithmetic number, because the mean of its divisors is an integer number (77538735).

Almost surely, 2^2012121320 is an apocalyptic number.

2012121320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2012121320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2481239520).

2012121320 is an abundant number, since it is smaller than the sum of its proper divisors (2950357720).

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

2012121320 is a wasteful number, since it uses less digits than its factorization.

2012121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21906 (or 21902 counting only the distinct ones).

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

The square root of 2012121320 is about 44856.6753114851. The cubic root of 2012121320 is about 1262.4612427405.

Adding to 2012121320 its reverse (231212102), we get a palindrome (2243333422).

The spelling of 2012121320 in words is "two billion, twelve million, one hundred twenty-one thousand, three hundred twenty".