21125445324 has 48 divisors (see below), whose sum is σ = 51447765600. Its totient is φ = 6740431360.

The previous prime is 21125445323. The next prime is 21125445331. The reversal of 21125445324 is 42354452112.

It is not an unprimeable number, because it can be changed into a prime (21125445323) 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 15 ways as a sum of consecutive naturals, for example, 378999 + ... + 431150.

It is an arithmetic number, because the mean of its divisors is an integer number (1071828450).

Almost surely, 2^21125445324 is an apocalyptic number.

It is an amenable number.

21125445324 is an abundant number, since it is smaller than the sum of its proper divisors (30322320276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21125445324 is a wasteful number, since it uses less digits than its factorization.

21125445324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810250 (or 810248 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

Adding to 21125445324 its reverse (42354452112), we get a palindrome (63479897436).

The spelling of 21125445324 in words is "twenty-one billion, one hundred twenty-five million, four hundred forty-five thousand, three hundred twenty-four".