20201121121 has 8 divisors (see below), whose sum is σ = 20518112160. Its totient is φ = 19886130528.

The previous prime is 20201121113. The next prime is 20201121133. The reversal of 20201121121 is 12112110202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20201121121 - 2³ = 20201121113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201122121) 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, 479751 + ... + 520156.

It is an arithmetic number, because the mean of its divisors is an integer number (2564764020).

Almost surely, 2^20201121121 is an apocalyptic number.

It is an amenable number.

20201121121 is a deficient number, since it is larger than the sum of its proper divisors (316991039).

20201121121 is an equidigital number, since it uses as much as digits as its factorization.

20201121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000223.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20201121121 its reverse (12112110202), we get a palindrome (32313231323).

The spelling of 20201121121 in words is "twenty billion, two hundred one million, one hundred twenty-one thousand, one hundred twenty-one".