212221220212221 has 16 divisors (see below), whose sum is σ = 311741702422848. Its totient is φ = 127345466672000.

The previous prime is 212221220212217. The next prime is 212221220212249. The reversal of 212221220212221 is 122212022122212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212221220212221 - 2² = 212221220212217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212221220212191 and 212221220212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221220212721) 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, 31836363336 + ... + 31836370001.

It is an arithmetic number, because the mean of its divisors is an integer number (19483856401428).

Almost surely, 2^{212221220212221} is an apocalyptic number.

It is an amenable number.

212221220212221 is a deficient number, since it is larger than the sum of its proper divisors (99520482210627).

212221220212221 is a wasteful number, since it uses less digits than its factorization.

212221220212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63672733452.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 212221220212221 its reverse (122212022122212), we get a palindrome (334433242334433).

The spelling of 212221220212221 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".