20213122423 has 4 divisors (see below), whose sum is σ = 21767978008. Its totient is φ = 18658266840.

The previous prime is 20213122403. The next prime is 20213122427. The reversal of 20213122423 is 32422131202.

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 20213122423 - 2⁹ = 20213121911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213122394 and 20213122403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213122427) 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, 777427773 + ... + 777427798.

It is an arithmetic number, because the mean of its divisors is an integer number (5441994502).

Almost surely, 2^20213122423 is an apocalyptic number.

20213122423 is a deficient number, since it is larger than the sum of its proper divisors (1554855585).

20213122423 is a wasteful number, since it uses less digits than its factorization.

20213122423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554855584.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20213122423 its reverse (32422131202), we get a palindrome (52635253625).

The spelling of 20213122423 in words is "twenty billion, two hundred thirteen million, one hundred twenty-two thousand, four hundred twenty-three".