20100221212 has 12 divisors (see below), whose sum is σ = 35428448440. Its totient is φ = 9977807376.

The previous prime is 20100221209. The next prime is 20100221227. The reversal of 20100221212 is 21212200102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20100221192 and 20100221201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18075183 + ... + 18076294.

Almost surely, 2^20100221212 is an apocalyptic number.

It is an amenable number.

20100221212 is a deficient number, since it is larger than the sum of its proper divisors (15328227228).

20100221212 is a wasteful number, since it uses less digits than its factorization.

20100221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36151620 (or 36151618 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20100221212 its reverse (21212200102), we get a palindrome (41312421314).

The spelling of 20100221212 in words is "twenty billion, one hundred million, two hundred twenty-one thousand, two hundred twelve".