20023112121 has 4 divisors (see below), whose sum is σ = 26697482832. Its totient is φ = 13348741412.

The previous prime is 20023112113. The next prime is 20023112129. The reversal of 20023112121 is 12121132002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20023112113) and next prime (20023112129).

It is a cyclic number.

It is not a de Polignac number, because 20023112121 - 2³ = 20023112113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20023112121.

It is not an unprimeable number, because it can be changed into a prime (20023112129) 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, 3337185351 + ... + 3337185356.

It is an arithmetic number, because the mean of its divisors is an integer number (6674370708).

Almost surely, 2^20023112121 is an apocalyptic number.

It is an amenable number.

20023112121 is a deficient number, since it is larger than the sum of its proper divisors (6674370711).

20023112121 is an equidigital number, since it uses as much as digits as its factorization.

20023112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674370710.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20023112121 its reverse (12121132002), we get a palindrome (32144244123).

The spelling of 20023112121 in words is "twenty billion, twenty-three million, one hundred twelve thousand, one hundred twenty-one".