20201121011 has 4 divisors (see below), whose sum is σ = 20202511512. Its totient is φ = 20199730512.

The previous prime is 20201120993. The next prime is 20201121013. The reversal of 20201121011 is 11012110202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201121011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201120983 and 20201121001.

It is not an unprimeable number, because it can be changed into a prime (20201121013) 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, 673226 + ... + 702591.

It is an arithmetic number, because the mean of its divisors is an integer number (5050627878).

Almost surely, 2^20201121011 is an apocalyptic number.

20201121011 is a deficient number, since it is larger than the sum of its proper divisors (1390501).

20201121011 is a wasteful number, since it uses less digits than its factorization.

20201121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390500.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20201121011 its reverse (11012110202), we get a palindrome (31213231213).

The spelling of 20201121011 in words is "twenty billion, two hundred one million, one hundred twenty-one thousand, eleven".