20213403123 has 4 divisors (see below), whose sum is σ = 26951204168. Its totient is φ = 13475602080.

The previous prime is 20213403047. The next prime is 20213403131. The reversal of 20213403123 is 32130431202.

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

It is not a de Polignac number, because 20213403123 - 2¹⁸ = 20213140979 is a prime.

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 20213403123.

It is not an unprimeable number, because it can be changed into a prime (20213403143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368900518 + ... + 3368900523.

It is an arithmetic number, because the mean of its divisors is an integer number (6737801042).

Almost surely, 2^20213403123 is an apocalyptic number.

20213403123 is a deficient number, since it is larger than the sum of its proper divisors (6737801045).

20213403123 is an equidigital number, since it uses as much as digits as its factorization.

20213403123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737801044.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20213403123 its reverse (32130431202), we get a palindrome (52343834325).

The spelling of 20213403123 in words is "twenty billion, two hundred thirteen million, four hundred three thousand, one hundred twenty-three".