21432314421 has 32 divisors (see below), whose sum is σ = 36317388800. Its totient is φ = 12236955120.

The previous prime is 21432314413. The next prime is 21432314441. The reversal of 21432314421 is 12441323412.

21432314421 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 231 + 4 + 421 = 666.

It is not a de Polignac number, because 21432314421 - 2³ = 21432314413 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432314441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186600 + ... + 278718.

It is an arithmetic number, because the mean of its divisors is an integer number (1134918400).

Almost surely, 2^21432314421 is an apocalyptic number.

21432314421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21432314421 is a deficient number, since it is larger than the sum of its proper divisors (14885074379).

21432314421 is a wasteful number, since it uses less digits than its factorization.

21432314421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93366 (or 93360 counting only the distinct ones).

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

Adding to 21432314421 its reverse (12441323412), we get a palindrome (33873637833).

The spelling of 21432314421 in words is "twenty-one billion, four hundred thirty-two million, three hundred fourteen thousand, four hundred twenty-one".