21242122233421 has 8 divisors (see below), whose sum is σ = 21273251052224. Its totient is φ = 21210994536480.

The previous prime is 21242122233359. The next prime is 21242122233463. The reversal of 21242122233421 is 12433222124212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21242122233421 - 2³⁵ = 21207762495053 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 (21242122233121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42355696 + ... + 42854278.

It is an arithmetic number, because the mean of its divisors is an integer number (2659156381528).

Almost surely, 2^{21242122233421} is an apocalyptic number.

It is an amenable number.

21242122233421 is a deficient number, since it is larger than the sum of its proper divisors (31128818803).

21242122233421 is an equidigital number, since it uses as much as digits as its factorization.

21242122233421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560931.

The product of its digits is 18432, while the sum is 31.

Adding to 21242122233421 its reverse (12433222124212), we get a palindrome (33675344357633).

The spelling of 21242122233421 in words is "twenty-one trillion, two hundred forty-two billion, one hundred twenty-two million, two hundred thirty-three thousand, four hundred twenty-one".