20201021211121 has 16 divisors (see below), whose sum is σ = 20686496483520. Its totient is φ = 19720516478400.

The previous prime is 20201021211043. The next prime is 20201021211149. The reversal of 20201021211121 is 12111212010202.

It is a cyclic number.

It is not a de Polignac number, because 20201021211121 - 2²¹ = 20201019113969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201021211095 and 20201021211104.

It is not an unprimeable number, because it can be changed into a prime (20201021211181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10799571 + ... + 12531271.

It is an arithmetic number, because the mean of its divisors is an integer number (1292906030220).

Almost surely, 2^{20201021211121} is an apocalyptic number.

It is an amenable number.

20201021211121 is a deficient number, since it is larger than the sum of its proper divisors (485475272399).

20201021211121 is a wasteful number, since it uses less digits than its factorization.

20201021211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733136.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20201021211121 its reverse (12111212010202), we get a palindrome (32312233221323).

The spelling of 20201021211121 in words is "twenty trillion, two hundred one billion, twenty-one million, two hundred eleven thousand, one hundred twenty-one".