21223423342420 has 48 divisors (see below), whose sum is σ = 50523777037440. Its totient is φ = 7423901928576.

The previous prime is 21223423342399. The next prime is 21223423342441. The reversal of 21223423342420 is 2424332432212.

It is a happy number.

21223423342420 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21223423342399) and next prime (21223423342441).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2148114832 + ... + 2148124711.

It is an arithmetic number, because the mean of its divisors is an integer number (1052578688280).

Almost surely, 2^{21223423342420} is an apocalyptic number.

21223423342420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223423342420 is an abundant number, since it is smaller than the sum of its proper divisors (29300353695020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223423342420 is a wasteful number, since it uses less digits than its factorization.

21223423342420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296239584 (or 4296239582 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 34.

Adding to 21223423342420 its reverse (2424332432212), we get a palindrome (23647755774632).

The spelling of 21223423342420 in words is "twenty-one trillion, two hundred twenty-three billion, four hundred twenty-three million, three hundred forty-two thousand, four hundred twenty".