22121210221 has 8 divisors (see below), whose sum is σ = 24462808704. Its totient is φ = 19834708320.

The previous prime is 22121210219. The next prime is 22121210261. The reversal of 22121210221 is 12201212122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22121210221 - 2¹ = 22121210219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121210195 and 22121210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121210261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13773301 + ... + 13774906.

It is an arithmetic number, because the mean of its divisors is an integer number (3057851088).

Almost surely, 2^22121210221 is an apocalyptic number.

It is an amenable number.

22121210221 is a deficient number, since it is larger than the sum of its proper divisors (2341598483).

22121210221 is a wasteful number, since it uses less digits than its factorization.

22121210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27548291.

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

Adding to 22121210221 its reverse (12201212122), we get a palindrome (34322422343).

The spelling of 22121210221 in words is "twenty-two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".