20023021121 has 8 divisors (see below), whose sum is σ = 20615481384. Its totient is φ = 19433260800.

The previous prime is 20023021091. The next prime is 20023021127. The reversal of 20023021121 is 12112032002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16993729600 + 3029291521 = 130360^2 + 55039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20023021121 - 2³⁴ = 2843151937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20023021096 and 20023021105.

It is not an unprimeable number, because it can be changed into a prime (20023021127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659930 + ... + 689603.

It is an arithmetic number, because the mean of its divisors is an integer number (2576935173).

Almost surely, 2^20023021121 is an apocalyptic number.

It is an amenable number.

20023021121 is a deficient number, since it is larger than the sum of its proper divisors (592460263).

20023021121 is a wasteful number, since it uses less digits than its factorization.

20023021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349971.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20023021121 its reverse (12112032002), we get a palindrome (32135053123).

The spelling of 20023021121 in words is "twenty billion, twenty-three million, twenty-one thousand, one hundred twenty-one".