221211001200221 has 4 divisors (see below), whose sum is σ = 224011140456000. Its totient is φ = 218410861944444.

The previous prime is 221211001200191. The next prime is 221211001200227. The reversal of 221211001200221 is 122002100112122.

221211001200221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221211001200221 - 2¹⁸ = 221211000938077 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 221211001200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211001200227) 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, 1400069627771 + ... + 1400069627928.

It is an arithmetic number, because the mean of its divisors is an integer number (56002785114000).

Almost surely, 2^{221211001200221} is an apocalyptic number.

It is an amenable number.

221211001200221 is a deficient number, since it is larger than the sum of its proper divisors (2800139255779).

221211001200221 is an equidigital number, since it uses as much as digits as its factorization.

221211001200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800139255778.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221211001200221 its reverse (122002100112122), we get a palindrome (343213101312343).

The spelling of 221211001200221 in words is "two hundred twenty-one trillion, two hundred eleven billion, one million, two hundred thousand, two hundred twenty-one".