20201121 has 12 divisors (see below), whose sum is σ = 29532048. Its totient is φ = 13304664.

The previous prime is 20201113. The next prime is 20201141. The reversal of 20201121 is 12110202.

It is not a de Polignac number, because 20201121 - 2³ = 20201113 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20201101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12775 + ... + 14268.

It is an arithmetic number, because the mean of its divisors is an integer number (2461004).

Almost surely, 2^20201121 is an apocalyptic number.

It is an amenable number.

20201121 is a deficient number, since it is larger than the sum of its proper divisors (9330927).

20201121 is a wasteful number, since it uses less digits than its factorization.

20201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27132 (or 27129 counting only the distinct ones).

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

The square root of 20201121 is about 4494.5657187319. The cubic root of 20201121 is about 272.3486059703.

Adding to 20201121 its reverse (12110202), we get a palindrome (32311323).

The spelling of 20201121 in words is "twenty million, two hundred one thousand, one hundred twenty-one".