2000121220 has 12 divisors (see below), whose sum is σ = 4200254604. Its totient is φ = 800048480.

The previous prime is 2000121217. The next prime is 2000121223. The reversal of 2000121220 is 221210002.

It is an interprime number because it is at equal distance from previous prime (2000121217) and next prime (2000121223).

It can be written as a sum of positive squares in 2 ways, for example, as 1541818756 + 458302464 = 39266^2 + 21408^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2000121197 and 2000121206.

It is not an unprimeable number, because it can be changed into a prime (2000121223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50003011 + ... + 50003050.

It is an arithmetic number, because the mean of its divisors is an integer number (350021217).

Almost surely, 2^2000121220 is an apocalyptic number.

2000121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2000121220 is an abundant number, since it is smaller than the sum of its proper divisors (2200133384).

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

2000121220 is a wasteful number, since it uses less digits than its factorization.

2000121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100006070 (or 100006068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2000121220 is about 44722.7148102617. The cubic root of 2000121220 is about 1259.9465039856.

Adding to 2000121220 its reverse (221210002), we get a palindrome (2221331222).

The spelling of 2000121220 in words is "two billion, one hundred twenty-one thousand, two hundred twenty".