221000421211 has 4 divisors (see below), whose sum is σ = 221127947712. Its totient is φ = 220872894712.

The previous prime is 221000421199. The next prime is 221000421233. The reversal of 221000421211 is 112124000122.

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 221000421211 - 2²¹ = 220998324059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000421251) 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, 63760651 + ... + 63764116.

It is an arithmetic number, because the mean of its divisors is an integer number (55281986928).

Almost surely, 2^221000421211 is an apocalyptic number.

221000421211 is a deficient number, since it is larger than the sum of its proper divisors (127526501).

221000421211 is a wasteful number, since it uses less digits than its factorization.

221000421211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127526500.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221000421211 its reverse (112124000122), we get a palindrome (333124421333).

The spelling of 221000421211 in words is "two hundred twenty-one billion, four hundred twenty-one thousand, two hundred eleven".