20021221101123 has 16 divisors (see below), whose sum is σ = 32357529052800. Its totient is φ = 12134073394440.

The previous prime is 20021221101071. The next prime is 20021221101169. The reversal of 20021221101123 is 32110112212002.

20021221101123 is a `hidden beast` number, since 200 + 21 + 221 + 101 + 123 = 666.

It is not a de Polignac number, because 20021221101123 - 2⁶ = 20021221101059 is a prime.

It is a super-2 number, since 2×20021221101123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20021221101096 and 20021221101105.

It is not an unprimeable number, because it can be changed into a prime (20021221101173) 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, 33705759133 + ... + 33705759726.

It is an arithmetic number, because the mean of its divisors is an integer number (2022345565800).

Almost surely, 2^{20021221101123} is an apocalyptic number.

20021221101123 is a deficient number, since it is larger than the sum of its proper divisors (12336307951677).

20021221101123 is a wasteful number, since it uses less digits than its factorization.

20021221101123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67411518879 (or 67411518873 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20021221101123 its reverse (32110112212002), we get a palindrome (52131333313125).

The spelling of 20021221101123 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred twenty-three".