21125006032 has 80 divisors (see below), whose sum is σ = 44573827648. Its totient is φ = 9640995840.

The previous prime is 21125006027. The next prime is 21125006047. The reversal of 21125006032 is 23060052112.

It is a junction number, because it is equal to n+sod(n) for n = 21125005994 and 21125006012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7152268 + ... + 7155220.

Almost surely, 2^21125006032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21125006032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22286913824).

21125006032 is an abundant number, since it is smaller than the sum of its proper divisors (23448821616).

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

21125006032 is a wasteful number, since it uses less digits than its factorization.

21125006032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 3342 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21125006032 its reverse (23060052112), we get a palindrome (44185058144).

The spelling of 21125006032 in words is "twenty-one billion, one hundred twenty-five million, six thousand, thirty-two".