22001021221 has 8 divisors (see below), whose sum is σ = 22100904000. Its totient is φ = 21901236000.

The previous prime is 22001021213. The next prime is 22001021279. The reversal of 22001021221 is 12212010022.

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 22001021221 - 2³ = 22001021213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001021321) 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 7 ways as a sum of consecutive naturals, for example, 448305 + ... + 494953.

It is an arithmetic number, because the mean of its divisors is an integer number (2762613000).

Almost surely, 2^22001021221 is an apocalyptic number.

It is an amenable number.

22001021221 is a deficient number, since it is larger than the sum of its proper divisors (99882779).

22001021221 is a wasteful number, since it uses less digits than its factorization.

22001021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48779.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22001021221 its reverse (12212010022), we get a palindrome (34213031243).

The spelling of 22001021221 in words is "twenty-two billion, one million, twenty-one thousand, two hundred twenty-one".