212100121221212 has 48 divisors (see below), whose sum is σ = 429579838248960. Its totient is φ = 89747334847872.

The previous prime is 212100121221193. The next prime is 212100121221293. The reversal of 212100121221212 is 212122121001212.

It is a super-2 number, since 2×212100121221212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96110888 + ... + 98292944.

It is an arithmetic number, because the mean of its divisors is an integer number (8949579963520).

Almost surely, 2^{212100121221212} is an apocalyptic number.

It is an amenable number.

212100121221212 is an abundant number, since it is smaller than the sum of its proper divisors (217479717027748).

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

212100121221212 is a wasteful number, since it uses less digits than its factorization.

212100121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226090 (or 2226088 counting only the distinct ones).

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

Adding to 212100121221212 its reverse (212122121001212), we get a palindrome (424222242222424).

The spelling of 212100121221212 in words is "two hundred twelve trillion, one hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".