21040234232 has 32 divisors (see below), whose sum is σ = 39713846400. Its totient is φ = 10450004064.

The previous prime is 21040234211. The next prime is 21040234247. The reversal of 21040234232 is 23243204012.

It is a junction number, because it is equal to n+sod(n) for n = 21040234198 and 21040234207.

It is a congruent number.

It is an unprimeable number.

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, 1400183 + ... + 1415129.

It is an arithmetic number, because the mean of its divisors is an integer number (1241057700).

Almost surely, 2^21040234232 is an apocalyptic number.

It is an amenable number.

21040234232 is a deficient number, since it is larger than the sum of its proper divisors (18673612168).

21040234232 is a wasteful number, since it uses less digits than its factorization.

21040234232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16115 (or 16111 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21040234232 its reverse (23243204012), we get a palindrome (44283438244).

The spelling of 21040234232 in words is "twenty-one billion, forty million, two hundred thirty-four thousand, two hundred thirty-two".