22154230421 has 4 divisors (see below), whose sum is σ = 22159735872. Its totient is φ = 22148724972.

The previous prime is 22154230411. The next prime is 22154230523. The reversal of 22154230421 is 12403245122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12403245122 = 2 ⋅6201622561.

It is a cyclic number.

It is not a de Polignac number, because 22154230421 - 2³⁴ = 4974361237 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 (22154230411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2746685 + ... + 2754738.

It is an arithmetic number, because the mean of its divisors is an integer number (5539933968).

Almost surely, 2^22154230421 is an apocalyptic number.

It is an amenable number.

22154230421 is a deficient number, since it is larger than the sum of its proper divisors (5505451).

22154230421 is an equidigital number, since it uses as much as digits as its factorization.

22154230421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505450.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 22154230421 its reverse (12403245122), we get a palindrome (34557475543).

The spelling of 22154230421 in words is "twenty-two billion, one hundred fifty-four million, two hundred thirty thousand, four hundred twenty-one".