212121212450 has 24 divisors (see below), whose sum is σ = 450909092352. Its totient is φ = 72727272720.

The previous prime is 212121212449. The next prime is 212121212543. The reversal of 212121212450 is 54212121212.

212121212450 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 303029954 + ... + 303030653.

It is an arithmetic number, because the mean of its divisors is an integer number (18787878848).

Almost surely, 2^212121212450 is an apocalyptic number.

212121212450 is an abundant number, since it is smaller than the sum of its proper divisors (238787879902).

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

212121212450 is a wasteful number, since it uses less digits than its factorization.

212121212450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606060626 (or 606060621 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 212121212450 its reverse (54212121212), we get a palindrome (266333333662).

The spelling of 212121212450 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, four hundred fifty".