20200121201121 has 32 divisors (see below), whose sum is σ = 27141599232000. Its totient is φ = 13362885036480.

The previous prime is 20200121201119. The next prime is 20200121201191. The reversal of 20200121201121 is 12110212100202.

It is not a de Polignac number, because 20200121201121 - 2¹ = 20200121201119 is a prime.

It is a super-2 number, since 2×20200121201121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20200121201121.

It is not an unprimeable number, because it can be changed into a prime (20200121201191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2922890656 + ... + 2922897566.

It is an arithmetic number, because the mean of its divisors is an integer number (848174976000).

Almost surely, 2^{20200121201121} is an apocalyptic number.

It is an amenable number.

20200121201121 is a deficient number, since it is larger than the sum of its proper divisors (6941478030879).

20200121201121 is a wasteful number, since it uses less digits than its factorization.

20200121201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12709.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20200121201121 its reverse (12110212100202), we get a palindrome (32310333301323).

The spelling of 20200121201121 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-one".