21430332142423 has 4 divisors (see below), whose sum is σ = 21522307817088. Its totient is φ = 21338356467760.

The previous prime is 21430332142403. The next prime is 21430332142463. The reversal of 21430332142423 is 32424123303412.

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 21430332142423 - 2⁴¹ = 19231308886871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430332142403) 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, 45987836983 + ... + 45987837448.

It is an arithmetic number, because the mean of its divisors is an integer number (5380576954272).

Almost surely, 2^{21430332142423} is an apocalyptic number.

21430332142423 is a deficient number, since it is larger than the sum of its proper divisors (91975674665).

21430332142423 is an equidigital number, since it uses as much as digits as its factorization.

21430332142423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91975674664.

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 21430332142423 its reverse (32424123303412), we get a palindrome (53854455445835).

The spelling of 21430332142423 in words is "twenty-one trillion, four hundred thirty billion, three hundred thirty-two million, one hundred forty-two thousand, four hundred twenty-three".