21030310120 has 64 divisors (see below), whose sum is σ = 49263034320. Its totient is φ = 8072607744.

The previous prime is 21030310099. The next prime is 21030310123. The reversal of 21030310120 is 2101303012.

It can be written as a sum of positive squares in 8 ways, for example, as 18916701444 + 2113608676 = 137538^2 + 45974^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21030310120.

It is not an unprimeable number, because it can be changed into a prime (21030310123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10714 + ... + 205366.

Almost surely, 2^21030310120 is an apocalyptic number.

21030310120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030310120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24631517160).

21030310120 is an abundant number, since it is smaller than the sum of its proper divisors (28232724200).

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

21030310120 is a wasteful number, since it uses less digits than its factorization.

21030310120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194774 (or 194770 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21030310120 its reverse (2101303012), we get a palindrome (23131613132).

The spelling of 21030310120 in words is "twenty-one billion, thirty million, three hundred ten thousand, one hundred twenty".