22121021222101 has 4 divisors (see below), whose sum is σ = 22143663005292. Its totient is φ = 22098379438912.

The previous prime is 22121021222063. The next prime is 22121021222117. The reversal of 22121021222101 is 10122212012122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15679627982001 + 6441393240100 = 3959751^2 + 2537990^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121021222101 - 2¹⁹ = 22121020697813 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 (22121021222191) 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, 11320890130 + ... + 11320892083.

It is an arithmetic number, because the mean of its divisors is an integer number (5535915751323).

Almost surely, 2^{22121021222101} is an apocalyptic number.

It is an amenable number.

22121021222101 is a deficient number, since it is larger than the sum of its proper divisors (22641783191).

22121021222101 is an equidigital number, since it uses as much as digits as its factorization.

22121021222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22641783190.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22121021222101 its reverse (10122212012122), we get a palindrome (32243233234223).

The spelling of 22121021222101 in words is "twenty-two trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred one".