21232431004 has 24 divisors (see below), whose sum is σ = 37744576128. Its totient is φ = 10448778480.

The previous prime is 21232431001. The next prime is 21232431037. The reversal of 21232431004 is 40013423212.

It is a super-2 number, since 2×21232431004² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232431001) 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 7 ways as a sum of consecutive naturals, for example, 103027 + ... + 230389.

It is an arithmetic number, because the mean of its divisors is an integer number (1572690672).

Almost surely, 2^21232431004 is an apocalyptic number.

It is an amenable number.

21232431004 is a deficient number, since it is larger than the sum of its proper divisors (16512145124).

21232431004 is a wasteful number, since it uses less digits than its factorization.

21232431004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128025 (or 128023 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21232431004 its reverse (40013423212), we get a palindrome (61245854216).

The spelling of 21232431004 in words is "twenty-one billion, two hundred thirty-two million, four hundred thirty-one thousand, four".