2121201020 has 24 divisors (see below), whose sum is σ = 4456204368. Its totient is φ = 848160000.

The previous prime is 2121200987. The next prime is 2121201029. The reversal of 2121201020 is 201021212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2121200992 and 2121201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201029) 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, 38420 + ... + 75620.

It is an arithmetic number, because the mean of its divisors is an integer number (185675182).

Almost surely, 2^2121201020 is an apocalyptic number.

2121201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121201020 is an abundant number, since it is smaller than the sum of its proper divisors (2335003348).

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

2121201020 is a wasteful number, since it uses less digits than its factorization.

2121201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40061 (or 40059 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2121201020 is about 46056.4981300142. The cubic root of 2121201020 is about 1284.8742012739.

Adding to 2121201020 its reverse (201021212), we get a palindrome (2322222232).

The spelling of 2121201020 in words is "two billion, one hundred twenty-one million, two hundred one thousand, twenty".