21210120032 has 48 divisors (see below), whose sum is σ = 42680593872. Its totient is φ = 10371878400.

The previous prime is 21210120017. The next prime is 21210120037. The reversal of 21210120032 is 23002101212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210119989 and 21210120016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210120037) 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, 517907 + ... + 557357.

It is an arithmetic number, because the mean of its divisors is an integer number (889179039).

Almost surely, 2^21210120032 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 21210120032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21340296936).

21210120032 is an abundant number, since it is smaller than the sum of its proper divisors (21470473840).

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

21210120032 is a wasteful number, since it uses less digits than its factorization.

21210120032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39831 (or 39823 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21210120032 its reverse (23002101212), we get a palindrome (44212221244).

The spelling of 21210120032 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, thirty-two".