21426143306223 has 4 divisors (see below), whose sum is σ = 28568191074968. Its totient is φ = 14284095537480.

The previous prime is 21426143306173. The next prime is 21426143306327. The reversal of 21426143306223 is 32260334162412.

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

It is not a de Polignac number, because 21426143306223 - 2¹² = 21426143302127 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 (21426143306023) 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, 3571023884368 + ... + 3571023884373.

It is an arithmetic number, because the mean of its divisors is an integer number (7142047768742).

Almost surely, 2^{21426143306223} is an apocalyptic number.

21426143306223 is a deficient number, since it is larger than the sum of its proper divisors (7142047768745).

21426143306223 is an equidigital number, since it uses as much as digits as its factorization.

21426143306223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142047768744.

The product of its (nonzero) digits is 248832, while the sum is 39.

Adding to 21426143306223 its reverse (32260334162412), we get a palindrome (53686477468635).

The spelling of 21426143306223 in words is "twenty-one trillion, four hundred twenty-six billion, one hundred forty-three million, three hundred six thousand, two hundred twenty-three".