21030230212 has 6 divisors (see below), whose sum is σ = 36802902878. Its totient is φ = 10515115104.

The previous prime is 21030230197. The next prime is 21030230231. The reversal of 21030230212 is 21203203012.

It can be written as a sum of positive squares in only one way, i.e., 20916679876 + 113550336 = 144626^2 + 10656^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628778773 + ... + 2628778780.

Almost surely, 2^21030230212 is an apocalyptic number.

It is an amenable number.

21030230212 is a deficient number, since it is larger than the sum of its proper divisors (15772672666).

21030230212 is a wasteful number, since it uses less digits than its factorization.

21030230212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257557557 (or 5257557555 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21030230212 its reverse (21203203012), we get a palindrome (42233433224).

The spelling of 21030230212 in words is "twenty-one billion, thirty million, two hundred thirty thousand, two hundred twelve".