20213230123 has 4 divisors (see below), whose sum is σ = 21277084360. Its totient is φ = 19149375888.

The previous prime is 20213230033. The next prime is 20213230127. The reversal of 20213230123 is 32103231202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20213230123 - 2²¹ = 20211132971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1063854217 = 20213230123 / (2 + 0 + 2 + 1 + 3 + 2 + 3 + 0 + 1 + 2 + 3).

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 20213230123.

It is not an unprimeable number, because it can be changed into a prime (20213230127) 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, 531927090 + ... + 531927127.

It is an arithmetic number, because the mean of its divisors is an integer number (5319271090).

Almost surely, 2^20213230123 is an apocalyptic number.

20213230123 is a deficient number, since it is larger than the sum of its proper divisors (1063854237).

20213230123 is a wasteful number, since it uses less digits than its factorization.

20213230123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063854236.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20213230123 its reverse (32103231202), we get a palindrome (52316461325).

The spelling of 20213230123 in words is "twenty billion, two hundred thirteen million, two hundred thirty thousand, one hundred twenty-three".