210001221212 has 12 divisors (see below), whose sum is σ = 371140772856. Its totient is φ = 103961000400.

The previous prime is 210001221211. The next prime is 210001221223. The reversal of 210001221212 is 212122100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001221211) 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 3 ways as a sum of consecutive naturals, for example, 259902098 + ... + 259902905.

It is an arithmetic number, because the mean of its divisors is an integer number (30928397738).

Almost surely, 2^210001221212 is an apocalyptic number.

It is an amenable number.

210001221212 is a deficient number, since it is larger than the sum of its proper divisors (161139551644).

210001221212 is a wasteful number, since it uses less digits than its factorization.

210001221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519805108 (or 519805106 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210001221212 its reverse (212122100012), we get a palindrome (422123321224).

It can be divided in two parts, 2100012 and 21212, that multiplied together give a palindrome (44545454544).

The spelling of 210001221212 in words is "two hundred ten billion, one million, two hundred twenty-one thousand, two hundred twelve".