21030013230 has 128 divisors (see below), whose sum is σ = 53473996800. Its totient is φ = 5284468224.

The previous prime is 21030013157. The next prime is 21030013243. The reversal of 21030013230 is 3231003012.

It is a super-2 number, since 2×21030013230² (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 Curzon number.

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, 25065151 + ... + 25065989.

It is an arithmetic number, because the mean of its divisors is an integer number (417765600).

Almost surely, 2^21030013230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030013230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26736998400).

21030013230 is an abundant number, since it is smaller than the sum of its proper divisors (32443983570).

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

21030013230 is a wasteful number, since it uses less digits than its factorization.

21030013230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538.

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

Adding to 21030013230 its reverse (3231003012), we get a palindrome (24261016242).

The spelling of 21030013230 in words is "twenty-one billion, thirty million, thirteen thousand, two hundred thirty".