21120423144233 has 4 divisors (see below), whose sum is σ = 24137626450560. Its totient is φ = 18103219837908.

The previous prime is 21120423144199. The next prime is 21120423144341. The reversal of 21120423144233 is 33244132402112.

It is a happy number.

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 21120423144233 - 2³⁰ = 21119349402409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120423144233.

It is not an unprimeable number, because it can be changed into a prime (21120423144133) 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, 1508601653153 + ... + 1508601653166.

It is an arithmetic number, because the mean of its divisors is an integer number (6034406612640).

Almost surely, 2^{21120423144233} is an apocalyptic number.

It is an amenable number.

21120423144233 is a deficient number, since it is larger than the sum of its proper divisors (3017203306327).

21120423144233 is an equidigital number, since it uses as much as digits as its factorization.

21120423144233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017203306326.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21120423144233 its reverse (33244132402112), we get a palindrome (54364555546345).

The spelling of 21120423144233 in words is "twenty-one trillion, one hundred twenty billion, four hundred twenty-three million, one hundred forty-four thousand, two hundred thirty-three".