212202220001221 has 4 divisors (see below), whose sum is σ = 212208367439200. Its totient is φ = 212196072563244.

The previous prime is 212202220001203. The next prime is 212202220001267. The reversal of 212202220001221 is 122100022202212.

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 a de Polignac number, because none of the positive numbers 2^k-212202220001221 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 (212202220001021) 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, 3073667211 + ... + 3073736248.

It is an arithmetic number, because the mean of its divisors is an integer number (53052091859800).

Almost surely, 2^{212202220001221} is an apocalyptic number.

It is an amenable number.

212202220001221 is a deficient number, since it is larger than the sum of its proper divisors (6147437979).

212202220001221 is an equidigital number, since it uses as much as digits as its factorization.

212202220001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147437978.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212202220001221 its reverse (122100022202212), we get a palindrome (334302242203433).

The spelling of 212202220001221 in words is "two hundred twelve trillion, two hundred two billion, two hundred twenty million, one thousand, two hundred twenty-one".