21125420332 has 48 divisors (see below), whose sum is σ = 40395801600. Its totient is φ = 9629686080.

The previous prime is 21125420321. The next prime is 21125420339. The reversal of 21125420332 is 23302452112.

It is a junction number, because it is equal to n+sod(n) for n = 21125420297 and 21125420306.

It is not an unprimeable number, because it can be changed into a prime (21125420339) 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 15 ways as a sum of consecutive naturals, for example, 396678 + ... + 446770.

It is an arithmetic number, because the mean of its divisors is an integer number (841579200).

Almost surely, 2^21125420332 is an apocalyptic number.

It is an amenable number.

21125420332 is a deficient number, since it is larger than the sum of its proper divisors (19270381268).

21125420332 is a wasteful number, since it uses less digits than its factorization.

21125420332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50326 (or 50324 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21125420332 its reverse (23302452112), we get a palindrome (44427872444).

The spelling of 21125420332 in words is "twenty-one billion, one hundred twenty-five million, four hundred twenty thousand, three hundred thirty-two".