21030241312 has 48 divisors (see below), whose sum is σ = 42219334080. Its totient is φ = 10308840192.

The previous prime is 21030241301. The next prime is 21030241327. The reversal of 21030241312 is 21314203012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21030241312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689293 + ... + 719155.

It is an arithmetic number, because the mean of its divisors is an integer number (879569460).

Almost surely, 2^21030241312 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 21030241312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21109667040).

21030241312 is an abundant number, since it is smaller than the sum of its proper divisors (21189092768).

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

21030241312 is a wasteful number, since it uses less digits than its factorization.

21030241312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30305 (or 30297 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21030241312 its reverse (21314203012), we get a palindrome (42344444324).

The spelling of 21030241312 in words is "twenty-one billion, thirty million, two hundred forty-one thousand, three hundred twelve".