20205121223 has 4 divisors (see below), whose sum is σ = 23091567120. Its totient is φ = 17318675328.

The previous prime is 20205121207. The next prime is 20205121249. The reversal of 20205121223 is 32212150202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32212150202 = 2 ⋅16106075101.

It is a cyclic number.

It is not a de Polignac number, because 20205121223 - 2⁴ = 20205121207 is a prime.

It is a super-2 number, since 2×20205121223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20205121195 and 20205121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205121273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1443222938 + ... + 1443222951.

It is an arithmetic number, because the mean of its divisors is an integer number (5772891780).

Almost surely, 2^20205121223 is an apocalyptic number.

20205121223 is a deficient number, since it is larger than the sum of its proper divisors (2886445897).

20205121223 is an equidigital number, since it uses as much as digits as its factorization.

20205121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886445896.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20205121223 its reverse (32212150202), we get a palindrome (52417271425).

The spelling of 20205121223 in words is "twenty billion, two hundred five million, one hundred twenty-one thousand, two hundred twenty-three".