10020121220 has 24 divisors (see below), whose sum is σ = 21061552344. Its totient is φ = 4004372736.

The previous prime is 10020121213. The next prime is 10020121259. The reversal of 10020121220 is 2212102001.

It is a happy number.

10020121220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6074020096 + 3946101124 = 77936^2 + 62818^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207329 + ... + 251048.

It is an arithmetic number, because the mean of its divisors is an integer number (877564681).

Almost surely, 2^10020121220 is an apocalyptic number.

10020121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10020121220 is an abundant number, since it is smaller than the sum of its proper divisors (11041431124).

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

10020121220 is a wasteful number, since it uses less digits than its factorization.

10020121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459479 (or 459477 counting only the distinct ones).

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

Adding to 10020121220 its reverse (2212102001), we get a palindrome (12232223221).

The spelling of 10020121220 in words is "ten billion, twenty million, one hundred twenty-one thousand, two hundred twenty".