20201121121123 has 16 divisors (see below), whose sum is σ = 22132485485280. Its totient is φ = 18352645065216.

The previous prime is 20201121121091. The next prime is 20201121121183. The reversal of 20201121121123 is 32112112110202.

It is a cyclic number.

It is not a de Polignac number, because 20201121121123 - 2⁵ = 20201121121091 is a prime.

It is a super-2 number, since 2×20201121121123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20201121121123.

It is not an unprimeable number, because it can be changed into a prime (20201121121183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3102336 + ... + 7072957.

It is an arithmetic number, because the mean of its divisors is an integer number (1383280342830).

Almost surely, 2^{20201121121123} is an apocalyptic number.

20201121121123 is a deficient number, since it is larger than the sum of its proper divisors (1931364364157).

20201121121123 is a wasteful number, since it uses less digits than its factorization.

20201121121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10179366.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20201121121123 its reverse (32112112110202), we get a palindrome (52313233231325).

The spelling of 20201121121123 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-three".