21213303030 has 40 divisors (see below), whose sum is σ = 57040216992. Its totient is φ = 5656880592.

The previous prime is 21213303011. The next prime is 21213303037. The reversal of 21213303030 is 3030331212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21213302994 and 21213303012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213303037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13093822 + ... + 13095441.

Almost surely, 2^21213303030 is an apocalyptic number.

21213303030 is an abundant number, since it is smaller than the sum of its proper divisors (35826913962).

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

21213303030 is a wasteful number, since it uses less digits than its factorization.

21213303030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26189282 (or 26189273 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21213303030 its reverse (3030331212), we get a palindrome (24243634242).

The spelling of 21213303030 in words is "twenty-one billion, two hundred thirteen million, three hundred three thousand, thirty".