21213100230 has 128 divisors (see below), whose sum is σ = 58636763136. Its totient is φ = 4811184000.

The previous prime is 21213100219. The next prime is 21213100231. The reversal of 21213100230 is 3200131212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213100231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20183205 + ... + 20184255.

It is an arithmetic number, because the mean of its divisors is an integer number (458099712).

Almost surely, 2^21213100230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213100230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29318381568).

21213100230 is an abundant number, since it is smaller than the sum of its proper divisors (37423662906).

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

21213100230 is a wasteful number, since it uses less digits than its factorization.

21213100230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21213100230 its reverse (3200131212), we get a palindrome (24413231442).

The spelling of 21213100230 in words is "twenty-one billion, two hundred thirteen million, one hundred thousand, two hundred thirty".