212202211212221 has 4 divisors (see below), whose sum is σ = 212202257061312. Its totient is φ = 212202165363132.

The previous prime is 212202211212217. The next prime is 212202211212227. The reversal of 212202211212221 is 122212112202212.

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 212202211212221 - 2² = 212202211212217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202211212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15089531 + ... + 25536216.

It is an arithmetic number, because the mean of its divisors is an integer number (53050564265328).

Almost surely, 2^{212202211212221} is an apocalyptic number.

It is an amenable number.

212202211212221 is a deficient number, since it is larger than the sum of its proper divisors (45849091).

212202211212221 is an equidigital number, since it uses as much as digits as its factorization.

212202211212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45849090.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 212202211212221 its reverse (122212112202212), we get a palindrome (334414323414433).

The spelling of 212202211212221 in words is "two hundred twelve trillion, two hundred two billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-one".