21000313230 has 128 divisors (see below), whose sum is σ = 55483698816. Its totient is φ = 5055436800.

The previous prime is 21000313177. The next prime is 21000313247. The reversal of 21000313230 is 3231300012.

It is a super-2 number, since 2×21000313230² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4303552 + ... + 4308428.

It is an arithmetic number, because the mean of its divisors is an integer number (433466397).

Almost surely, 2^21000313230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000313230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27741849408).

21000313230 is an abundant number, since it is smaller than the sum of its proper divisors (34483385586).

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

21000313230 is a wasteful number, since it uses less digits than its factorization.

21000313230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21000313230 its reverse (3231300012), we get a palindrome (24231613242).

The spelling of 21000313230 in words is "twenty-one billion, three hundred thirteen thousand, two hundred thirty".