212221221001 has 4 divisors (see below), whose sum is σ = 212370358912. Its totient is φ = 212072083092.

The previous prime is 212221220971. The next prime is 212221221013. The reversal of 212221221001 is 100122122212.

It is a happy number.

212221221001 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 212221221001 - 2¹⁹ = 212220696713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221224001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74566821 + ... + 74569666.

It is an arithmetic number, because the mean of its divisors is an integer number (53092589728).

Almost surely, 2^212221221001 is an apocalyptic number.

It is an amenable number.

212221221001 is a deficient number, since it is larger than the sum of its proper divisors (149137911).

212221221001 is a wasteful number, since it uses less digits than its factorization.

212221221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149137910.

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

Adding to 212221221001 its reverse (100122122212), we get a palindrome (312343343213).

The spelling of 212221221001 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one".