210021121221212 has 12 divisors (see below), whose sum is σ = 420042242442480. Its totient is φ = 90009051951936.

The previous prime is 210021121221113. The next prime is 210021121221227. The reversal of 210021121221212 is 212122121120012.

210021121221212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

210021121221212 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750377164637 + ... + 3750377164692.

It is an arithmetic number, because the mean of its divisors is an integer number (35003520203540).

Almost surely, 2^{210021121221212} is an apocalyptic number.

It is an amenable number.

210021121221212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

210021121221212 is a wasteful number, since it uses less digits than its factorization.

210021121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7500754329340 (or 7500754329338 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 210021121221212 its reverse (212122121120012), we get a palindrome (422143242341224).

The spelling of 210021121221212 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".