21421432323 has 6 divisors (see below), whose sum is σ = 30942068924. Its totient is φ = 14280954876.

The previous prime is 21421432321. The next prime is 21421432327. The reversal of 21421432323 is 32323412412.

21421432323 is a `hidden beast` number, since 2 + 1 + 421 + 4 + 3 + 232 + 3 = 666.

It is not a de Polignac number, because 21421432323 - 2¹ = 21421432321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421432321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1190079565 + ... + 1190079582.

Almost surely, 2^21421432323 is an apocalyptic number.

21421432323 is a deficient number, since it is larger than the sum of its proper divisors (9520636601).

21421432323 is a wasteful number, since it uses less digits than its factorization.

21421432323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380159153 (or 2380159150 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21421432323 its reverse (32323412412), we get a palindrome (53744844735).

The spelling of 21421432323 in words is "twenty-one billion, four hundred twenty-one million, four hundred thirty-two thousand, three hundred twenty-three".