212213323031221 has 4 divisors (see below), whose sum is σ = 212240298165952. Its totient is φ = 212186347896492.

The previous prime is 212213323031207. The next prime is 212213323031287. The reversal of 212213323031221 is 122130323312212.

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 212213323031221 - 2⁴¹ = 210014299775669 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 212213323031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212213323031201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13487555565 + ... + 13487571298.

It is an arithmetic number, because the mean of its divisors is an integer number (53060074541488).

Almost surely, 2^{212213323031221} is an apocalyptic number.

It is an amenable number.

212213323031221 is a deficient number, since it is larger than the sum of its proper divisors (26975134731).

212213323031221 is an equidigital number, since it uses as much as digits as its factorization.

212213323031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26975134730.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 212213323031221 its reverse (122130323312212), we get a palindrome (334343646343433).

The spelling of 212213323031221 in words is "two hundred twelve trillion, two hundred thirteen billion, three hundred twenty-three million, thirty-one thousand, two hundred twenty-one".