21212002230 has 64 divisors (see below), whose sum is σ = 53680354560. Its totient is φ = 5349608064.

The previous prime is 21212002193. The next prime is 21212002261. The reversal of 21212002230 is 3220021212.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 302892 + ... + 366288.

It is an arithmetic number, because the mean of its divisors is an integer number (838755540).

Almost surely, 2^21212002230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212002230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26840177280).

21212002230 is an abundant number, since it is smaller than the sum of its proper divisors (32468352330).

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

21212002230 is a wasteful number, since it uses less digits than its factorization.

21212002230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64013.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21212002230 its reverse (3220021212), we get a palindrome (24432023442).

The spelling of 21212002230 in words is "twenty-one billion, two hundred twelve million, two thousand, two hundred thirty".