22122012121221 has 4 divisors (see below), whose sum is σ = 29496016161632. Its totient is φ = 14748008080812.

The previous prime is 22122012121217. The next prime is 22122012121301. The reversal of 22122012121221 is 12212121022122.

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 not a de Polignac number, because 22122012121221 - 2² = 22122012121217 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 (22122012121421) 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, 3687002020201 + ... + 3687002020206.

It is an arithmetic number, because the mean of its divisors is an integer number (7374004040408).

Almost surely, 2^{22122012121221} is an apocalyptic number.

It is an amenable number.

22122012121221 is a deficient number, since it is larger than the sum of its proper divisors (7374004040411).

22122012121221 is an equidigital number, since it uses as much as digits as its factorization.

22122012121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374004040410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22122012121221 its reverse (12212121022122), we get a palindrome (34334133143343).

The spelling of 22122012121221 in words is "twenty-two trillion, one hundred twenty-two billion, twelve million, one hundred twenty-one thousand, two hundred twenty-one".