21223434234023 has 16 divisors (see below), whose sum is σ = 24529831786560. Its totient is φ = 17986443503616.

The previous prime is 21223434234019. The next prime is 21223434234073. The reversal of 21223434234023 is 32043243432212.

It is not a de Polignac number, because 21223434234023 - 2² = 21223434234019 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 (21223434234073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32477390 + ... + 33124427.

It is an arithmetic number, because the mean of its divisors is an integer number (1533114486660).

Almost surely, 2^{21223434234023} is an apocalyptic number.

21223434234023 is a deficient number, since it is larger than the sum of its proper divisors (3306397552537).

21223434234023 is a wasteful number, since it uses less digits than its factorization.

21223434234023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65602346.

The product of its (nonzero) digits is 165888, while the sum is 35.

Adding to 21223434234023 its reverse (32043243432212), we get a palindrome (53266677666235).

The spelling of 21223434234023 in words is "twenty-one trillion, two hundred twenty-three billion, four hundred thirty-four million, two hundred thirty-four thousand, twenty-three".