2011020121 has 6 divisors (see below), whose sum is σ = 2210460266. Its totient is φ = 1828200000.

The previous prime is 2011020113. The next prime is 2011020139. The reversal of 2011020121 is 1210201102.

It can be written as a sum of positive squares in only one way, i.e., 1223600400 + 787419721 = 34980^2 + 28061^2 .

It is not a de Polignac number, because 2011020121 - 2³ = 2011020113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011020098 and 2011020107.

It is not an unprimeable number, because it can be changed into a prime (2011020721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8309880 + ... + 8310121.

Almost surely, 2^2011020121 is an apocalyptic number.

It is an amenable number.

2011020121 is a deficient number, since it is larger than the sum of its proper divisors (199440145).

2011020121 is a wasteful number, since it uses less digits than its factorization.

2011020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16620023 (or 16620012 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2011020121 is about 44844.3989925163. The cubic root of 2011020121 is about 1262.2308930202.

Adding to 2011020121 its reverse (1210201102), we get a palindrome (3221221223).

The spelling of 2011020121 in words is "two billion, eleven million, twenty thousand, one hundred twenty-one".