212221212001021 has 4 divisors (see below), whose sum is σ = 212549220057312. Its totient is φ = 211893203944732.

The previous prime is 212221212000947. The next prime is 212221212001027. The reversal of 212221212001021 is 120100212122212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212221212001021 - 2¹¹ = 212221211998973 is a prime.

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 212221212001021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221212001027) 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 3 ways as a sum of consecutive naturals, for example, 164004027175 + ... + 164004028468.

It is an arithmetic number, because the mean of its divisors is an integer number (53137305014328).

Almost surely, 2^{212221212001021} is an apocalyptic number.

It is an amenable number.

212221212001021 is a deficient number, since it is larger than the sum of its proper divisors (328008056291).

212221212001021 is an equidigital number, since it uses as much as digits as its factorization.

212221212001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328008056290.

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

Adding to 212221212001021 its reverse (120100212122212), we get a palindrome (332321424123233).

The spelling of 212221212001021 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred twelve million, one thousand, twenty-one".