20142172423 has 2 divisors, whose sum is σ = 20142172424. Its totient is φ = 20142172422.

The previous prime is 20142172409. The next prime is 20142172447. The reversal of 20142172423 is 32427124102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20142172423 - 2²¹ = 20140075271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20142172391 and 20142172400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20142172223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071086211 + 10071086212.

It is an arithmetic number, because the mean of its divisors is an integer number (10071086212).

Almost surely, 2^20142172423 is an apocalyptic number.

20142172423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142172423 is an equidigital number, since it uses as much as digits as its factorization.

20142172423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

Adding to 20142172423 its reverse (32427124102), we get a palindrome (52569296525).

The spelling of 20142172423 in words is "twenty billion, one hundred forty-two million, one hundred seventy-two thousand, four hundred twenty-three".