21423041121 has 16 divisors (see below), whose sum is σ = 28628064000. Its totient is φ = 14250055680.

The previous prime is 21423041111. The next prime is 21423041183. The reversal of 21423041121 is 12114032412.

It is not a de Polignac number, because 21423041121 - 2⁵ = 21423041089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423041111) 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 15 ways as a sum of consecutive naturals, for example, 3841291 + ... + 3846863.

It is an arithmetic number, because the mean of its divisors is an integer number (1789254000).

Almost surely, 2^21423041121 is an apocalyptic number.

It is an amenable number.

21423041121 is a deficient number, since it is larger than the sum of its proper divisors (7205022879).

21423041121 is a wasteful number, since it uses less digits than its factorization.

21423041121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8216.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21423041121 its reverse (12114032412), we get a palindrome (33537073533).

The spelling of 21423041121 in words is "twenty-one billion, four hundred twenty-three million, forty-one thousand, one hundred twenty-one".