21431423331 has 24 divisors (see below), whose sum is σ = 32591991120. Its totient is φ = 13533060096.

The previous prime is 21431423291. The next prime is 21431423333. The reversal of 21431423331 is 13332413412.

It is a happy number.

21431423331 is a `hidden beast` number, since 2 + 14 + 314 + 2 + 3 + 331 = 666.

It is not a de Polignac number, because 21431423331 - 2⁹ = 21431422819 is a prime.

It is a super-2 number, since 2×21431423331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21431423295 and 21431423304.

It is not an unprimeable number, because it can be changed into a prime (21431423333) 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 23 ways as a sum of consecutive naturals, for example, 1328691 + ... + 1344723.

It is an arithmetic number, because the mean of its divisors is an integer number (1357999630).

Almost surely, 2^21431423331 is an apocalyptic number.

21431423331 is a deficient number, since it is larger than the sum of its proper divisors (11160567789).

21431423331 is a wasteful number, since it uses less digits than its factorization.

21431423331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23875 (or 23872 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21431423331 its reverse (13332413412), we get a palindrome (34763836743).

The spelling of 21431423331 in words is "twenty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, three hundred thirty-one".