21303121410 has 96 divisors (see below), whose sum is σ = 57832939008. Its totient is φ = 5430395520.

The previous prime is 21303121409. The next prime is 21303121417. The reversal of 21303121410 is 1412130312.

21303121410 is a `hidden beast` number, since 2 + 130 + 3 + 121 + 410 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21303121417) 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 47 ways as a sum of consecutive naturals, for example, 5527044 + ... + 5530896.

It is an arithmetic number, because the mean of its divisors is an integer number (602426448).

Almost surely, 2^21303121410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21303121410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28916469504).

21303121410 is an abundant number, since it is smaller than the sum of its proper divisors (36529817598).

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

21303121410 is a wasteful number, since it uses less digits than its factorization.

21303121410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6560 (or 6557 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21303121410 its reverse (1412130312), we get a palindrome (22715251722).

The spelling of 21303121410 in words is "twenty-one billion, three hundred three million, one hundred twenty-one thousand, four hundred ten".