21432344121 has 64 divisors (see below), whose sum is σ = 33453638400. Its totient is φ = 13711965120.

The previous prime is 21432344119. The next prime is 21432344123. The reversal of 21432344121 is 12144323412.

21432344121 is a `hidden beast` number, since 2 + 14 + 3 + 234 + 412 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21432344119) and next prime (21432344123).

It is not a de Polignac number, because 21432344121 - 2¹ = 21432344119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21432344123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11478630 + ... + 11480496.

It is an arithmetic number, because the mean of its divisors is an integer number (522713100).

Almost surely, 2^21432344121 is an apocalyptic number.

It is an amenable number.

21432344121 is a deficient number, since it is larger than the sum of its proper divisors (12021294279).

21432344121 is an equidigital number, since it uses as much as digits as its factorization.

21432344121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098 (or 2080 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21432344121 its reverse (12144323412), we get a palindrome (33576667533).

The spelling of 21432344121 in words is "twenty-one billion, four hundred thirty-two million, three hundred forty-four thousand, one hundred twenty-one".