212101220205 has 48 divisors (see below), whose sum is σ = 444877864704. Its totient is φ = 91256993280.

The previous prime is 212101220197. The next prime is 212101220251. The reversal of 212101220205 is 502022101212.

It is not a de Polignac number, because 212101220205 - 2³ = 212101220197 is a prime.

It is a super-2 number, since 2×212101220205² (a number of 23 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 47 ways as a sum of consecutive naturals, for example, 19798681 + ... + 19809390.

It is an arithmetic number, because the mean of its divisors is an integer number (9268288848).

Almost surely, 2^212101220205 is an apocalyptic number.

It is an amenable number.

212101220205 is an abundant number, since it is smaller than the sum of its proper divisors (232776644499).

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

212101220205 is a wasteful number, since it uses less digits than its factorization.

212101220205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39608106 (or 39608103 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 212101220205 its reverse (502022101212), we get a palindrome (714123321417).

The spelling of 212101220205 in words is "two hundred twelve billion, one hundred one million, two hundred twenty thousand, two hundred five".