20020121010 has 24 divisors (see below), whose sum is σ = 52052314860. Its totient is φ = 5338698912.

The previous prime is 20020120997. The next prime is 20020121057. The reversal of 20020121010 is 1012102002.

It can be written as a sum of positive squares in 2 ways, for example, as 19912314321 + 107806689 = 141111^2 + 10383^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20020120983 and 20020121001.

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 11 ways as a sum of consecutive naturals, for example, 111222805 + ... + 111222984.

Almost surely, 2^20020121010 is an apocalyptic number.

20020121010 is an abundant number, since it is smaller than the sum of its proper divisors (32032193850).

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

20020121010 is a wasteful number, since it uses less digits than its factorization.

20020121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222445802 (or 222445799 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20020121010 its reverse (1012102002), we get a palindrome (21032223012).

The spelling of 20020121010 in words is "twenty billion, twenty million, one hundred twenty-one thousand, ten".