212012221201221 has 32 divisors (see below), whose sum is σ = 340137922677760. Its totient is φ = 114750517660416.

The previous prime is 212012221201199. The next prime is 212012221201237. The reversal of 212012221201221 is 122102122210212.

It is not a de Polignac number, because 212012221201221 - 2⁹ = 212012221200709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012221221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51284596 + ... + 55264221.

It is an arithmetic number, because the mean of its divisors is an integer number (10629310083680).

Almost surely, 2^{212012221201221} is an apocalyptic number.

212012221201221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212012221201221 is a deficient number, since it is larger than the sum of its proper divisors (128125701476539).

212012221201221 is a wasteful number, since it uses less digits than its factorization.

212012221201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106553833.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212012221201221 its reverse (122102122210212), we get a palindrome (334114343411433).

The spelling of 212012221201221 in words is "two hundred twelve trillion, twelve billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".