21423241331423 has 4 divisors (see below), whose sum is σ = 21423288822048. Its totient is φ = 21423193840800.

The previous prime is 21423241331419. The next prime is 21423241331447. The reversal of 21423241331423 is 32413314232412.

It is a happy number.

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 21423241331423 - 2² = 21423241331419 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 (21423241336423) 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, 23062103 + ... + 23973048.

It is an arithmetic number, because the mean of its divisors is an integer number (5355822205512).

Almost surely, 2^{21423241331423} is an apocalyptic number.

21423241331423 is a deficient number, since it is larger than the sum of its proper divisors (47490625).

21423241331423 is an equidigital number, since it uses as much as digits as its factorization.

21423241331423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47490624.

The product of its digits is 82944, while the sum is 35.

Adding to 21423241331423 its reverse (32413314232412), we get a palindrome (53836555563835).

The spelling of 21423241331423 in words is "twenty-one trillion, four hundred twenty-three billion, two hundred forty-one million, three hundred thirty-one thousand, four hundred twenty-three".