212012120201221 has 8 divisors (see below), whose sum is σ = 217212524696664. Its totient is φ = 206813114618880.

The previous prime is 212012120201159. The next prime is 212012120201251. The reversal of 212012120201221 is 122102021210212.

It can be written as a sum of positive squares in 4 ways, for example, as 7273539302500 + 204738580898721 = 2696950^2 + 14308689^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212012120201221 - 2³⁹ = 211462364387333 is a prime.

It is a super-2 number, since 2×212012120201221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012120201251) 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, 349421446 + ... + 350027671.

It is an arithmetic number, because the mean of its divisors is an integer number (27151565587083).

Almost surely, 2^{212012120201221} is an apocalyptic number.

It is an amenable number.

212012120201221 is a deficient number, since it is larger than the sum of its proper divisors (5200404495443).

212012120201221 is an equidigital number, since it uses as much as digits as its factorization.

212012120201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699456551.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212012120201221 its reverse (122102021210212), we get a palindrome (334114141411433).

The spelling of 212012120201221 in words is "two hundred twelve trillion, twelve billion, one hundred twenty million, two hundred one thousand, two hundred twenty-one".