22101210221 has 4 divisors (see below), whose sum is σ = 22412494944. Its totient is φ = 21789925500.

The previous prime is 22101210199. The next prime is 22101210227. The reversal of 22101210221 is 12201210122.

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 22101210221 - 2¹⁴ = 22101193837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101210196 and 22101210205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101210227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155642255 + ... + 155642396.

It is an arithmetic number, because the mean of its divisors is an integer number (5603123736).

Almost surely, 2^22101210221 is an apocalyptic number.

It is an amenable number.

22101210221 is a deficient number, since it is larger than the sum of its proper divisors (311284723).

22101210221 is an equidigital number, since it uses as much as digits as its factorization.

22101210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311284722.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22101210221 its reverse (12201210122), we get a palindrome (34302420343).

Subtracting from 22101210221 its reverse (12201210122), we obtain a palindrome (9900000099).

The spelling of 22101210221 in words is "twenty-two billion, one hundred one million, two hundred ten thousand, two hundred twenty-one".