21421134232 has 32 divisors (see below), whose sum is σ = 40993840800. Its totient is φ = 10490148864.

The previous prime is 21421134209. The next prime is 21421134233. The reversal of 21421134232 is 23243112412.

It is a junction number, because it is equal to n+sod(n) for n = 21421134197 and 21421134206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421134233) 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 7 ways as a sum of consecutive naturals, for example, 200869 + ... + 288427.

It is an arithmetic number, because the mean of its divisors is an integer number (1281057525).

Almost surely, 2^21421134232 is an apocalyptic number.

It is an amenable number.

21421134232 is a deficient number, since it is larger than the sum of its proper divisors (19572706568).

21421134232 is a wasteful number, since it uses less digits than its factorization.

21421134232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88195 (or 88191 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 21421134232 its reverse (23243112412), we get a palindrome (44664246644).

The spelling of 21421134232 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, two hundred thirty-two".