21212010330 has 96 divisors (see below), whose sum is σ = 60338058624. Its totient is φ = 4756961664.

The previous prime is 21212010319. The next prime is 21212010353. The reversal of 21212010330 is 3301021212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58222 + ... + 214041.

It is an arithmetic number, because the mean of its divisors is an integer number (628521444).

Almost surely, 2^21212010330 is an apocalyptic number.

21212010330 is an abundant number, since it is smaller than the sum of its proper divisors (39126048294).

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

21212010330 is a wasteful number, since it uses less digits than its factorization.

21212010330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272340 (or 272333 counting only the distinct ones).

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

Adding to 21212010330 its reverse (3301021212), we get a palindrome (24513031542).

The spelling of 21212010330 in words is "twenty-one billion, two hundred twelve million, ten thousand, three hundred thirty".