212020111101221 has 16 divisors (see below), whose sum is σ = 224620177904640. Its totient is φ = 199885217550720.

The previous prime is 212020111101217. The next prime is 212020111101247. The reversal of 212020111101221 is 122101111020212.

It is a cyclic number.

It is not a de Polignac number, because 212020111101221 - 2² = 212020111101217 is a prime.

It is a super-2 number, since 2×212020111101221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212020111101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020111100221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696214886 + ... + 696519351.

It is an arithmetic number, because the mean of its divisors is an integer number (14038761119040).

Almost surely, 2^{212020111101221} is an apocalyptic number.

It is an amenable number.

212020111101221 is a deficient number, since it is larger than the sum of its proper divisors (12600066803419).

212020111101221 is a wasteful number, since it uses less digits than its factorization.

212020111101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392734404.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212020111101221 its reverse (122101111020212), we get a palindrome (334121222121433).

The spelling of 212020111101221 in words is "two hundred twelve trillion, twenty billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".