21243021430223 has 32 divisors (see below), whose sum is σ = 22473664012800. Its totient is φ = 20040023203200.

The previous prime is 21243021430157. The next prime is 21243021430231. The reversal of 21243021430223 is 32203412034212.

It is a cyclic number.

It is not a de Polignac number, because 21243021430223 - 2¹⁰ = 21243021429199 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 (21243021430523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 910182488 + ... + 910205826.

It is an arithmetic number, because the mean of its divisors is an integer number (702302000400).

Almost surely, 2^{21243021430223} is an apocalyptic number.

21243021430223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21243021430223 is a deficient number, since it is larger than the sum of its proper divisors (1230642582577).

21243021430223 is a wasteful number, since it uses less digits than its factorization.

21243021430223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25343.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21243021430223 its reverse (32203412034212), we get a palindrome (53446433464435).

The spelling of 21243021430223 in words is "twenty-one trillion, two hundred forty-three billion, twenty-one million, four hundred thirty thousand, two hundred twenty-three".