21443421242233 has 4 divisors (see below), whose sum is σ = 21714856954240. Its totient is φ = 21171985530228.

The previous prime is 21443421242197. The next prime is 21443421242251. The reversal of 21443421242233 is 33224212434412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21443421242233 - 2²⁵ = 21443387687801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21443421242192 and 21443421242201.

It is not an unprimeable number, because it can be changed into a prime (21443421272233) 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, 135717855885 + ... + 135717856042.

It is an arithmetic number, because the mean of its divisors is an integer number (5428714238560).

Almost surely, 2^{21443421242233} is an apocalyptic number.

It is an amenable number.

21443421242233 is a deficient number, since it is larger than the sum of its proper divisors (271435712007).

21443421242233 is an equidigital number, since it uses as much as digits as its factorization.

21443421242233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271435712006.

The product of its digits is 221184, while the sum is 37.

Adding to 21443421242233 its reverse (33224212434412), we get a palindrome (54667633676645).

The spelling of 21443421242233 in words is "twenty-one trillion, four hundred forty-three billion, four hundred twenty-one million, two hundred forty-two thousand, two hundred thirty-three".