21030213212 has 6 divisors (see below), whose sum is σ = 36802873128. Its totient is φ = 10515106604.

The previous prime is 21030213151. The next prime is 21030213221. The reversal of 21030213212 is 21231203012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628776648 + ... + 2628776655.

It is an arithmetic number, because the mean of its divisors is an integer number (6133812188).

Almost surely, 2^21030213212 is an apocalyptic number.

It is an amenable number.

21030213212 is a deficient number, since it is larger than the sum of its proper divisors (15772659916).

21030213212 is a wasteful number, since it uses less digits than its factorization.

21030213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257553307 (or 5257553305 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21030213212 its reverse (21231203012), we get a palindrome (42261416224).

The spelling of 21030213212 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, two hundred twelve".