221421203532211 has 4 divisors (see below), whose sum is σ = 228563823001024. Its totient is φ = 214278584063400.

The previous prime is 221421203532203. The next prime is 221421203532241. The reversal of 221421203532211 is 112235302124122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221421203532211 - 2³ = 221421203532203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 7142619468781 = 221421203532211 / (2 + 2 + 1 + 4 + 2 + 1 + 2 + 0 + 3 + 5 + 3 + 2 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221421203532241) 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, 3571309734360 + ... + 3571309734421.

It is an arithmetic number, because the mean of its divisors is an integer number (57140955750256).

Almost surely, 2^{221421203532211} is an apocalyptic number.

221421203532211 is a deficient number, since it is larger than the sum of its proper divisors (7142619468813).

221421203532211 is an equidigital number, since it uses as much as digits as its factorization.

221421203532211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142619468812.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 221421203532211 its reverse (112235302124122), we get a palindrome (333656505656333).

The spelling of 221421203532211 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, five hundred thirty-two thousand, two hundred eleven".