22121000011221 has 4 divisors (see below), whose sum is σ = 29494666681632. Its totient is φ = 14747333340812.

The previous prime is 22121000011211. The next prime is 22121000011241. The reversal of 22121000011221 is 12211000012122.

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 22121000011221 - 2¹⁷ = 22120999880149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22121000011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121000011211) 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, 3686833335201 + ... + 3686833335206.

It is an arithmetic number, because the mean of its divisors is an integer number (7373666670408).

Almost surely, 2^{22121000011221} is an apocalyptic number.

It is an amenable number.

22121000011221 is a deficient number, since it is larger than the sum of its proper divisors (7373666670411).

22121000011221 is an equidigital number, since it uses as much as digits as its factorization.

22121000011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7373666670410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22121000011221 its reverse (12211000012122), we get a palindrome (34332000023343).

Subtracting from 22121000011221 its reverse (12211000012122), we obtain a palindrome (9909999999099).

The spelling of 22121000011221 in words is "twenty-two trillion, one hundred twenty-one billion, eleven thousand, two hundred twenty-one".