212100000022221 has 8 divisors (see below), whose sum is σ = 290443243273824. Its totient is φ = 137578378392720.

The previous prime is 212100000022213. The next prime is 212100000022243. The reversal of 212100000022221 is 122220000001212.

212100000022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212100000022221 - 2³ = 212100000022213 is a prime.

It is a super-2 number, since 2×212100000022221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212100000022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100000022121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955405405395 + ... + 955405405616.

It is an arithmetic number, because the mean of its divisors is an integer number (36305405409228).

Almost surely, 2^{212100000022221} is an apocalyptic number.

It is an amenable number.

212100000022221 is a deficient number, since it is larger than the sum of its proper divisors (78343243251603).

212100000022221 is a wasteful number, since it uses less digits than its factorization.

212100000022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910810811051.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212100000022221 its reverse (122220000001212), we get a palindrome (334320000023433).

The spelling of 212100000022221 in words is "two hundred twelve trillion, one hundred billion, twenty-two thousand, two hundred twenty-one".