212121100222122 has 64 divisors (see below), whose sum is σ = 536256253419264. Its totient is φ = 54432025712640.

The previous prime is 212121100222067. The next prime is 212121100222189. The reversal of 212121100222122 is 221222001121212.

It is a super-3 number, since 3×212121100222122³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5249982279 + ... + 5250022682.

It is an arithmetic number, because the mean of its divisors is an integer number (8379003959676).

Almost surely, 2^{212121100222122} is an apocalyptic number.

212121100222122 is an abundant number, since it is smaller than the sum of its proper divisors (324135153197142).

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

212121100222122 is a wasteful number, since it uses less digits than its factorization.

212121100222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500005023.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212121100222122 its reverse (221222001121212), we get a palindrome (433343101343334).

The spelling of 212121100222122 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred million, two hundred twenty-two thousand, one hundred twenty-two".