22012221111121 has 2 divisors, whose sum is σ = 22012221111122. Its totient is φ = 22012221111120.

The previous prime is 22012221111119. The next prime is 22012221111227. The reversal of 22012221111121 is 12111112221022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13999420896400 + 8012800214721 = 3741580^2 + 2830689^2 .

It is a cyclic number.

It is not a de Polignac number, because 22012221111121 - 2¹ = 22012221111119 is a prime.

Together with 22012221111119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22012221711121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006110555560 + 11006110555561.

It is an arithmetic number, because the mean of its divisors is an integer number (11006110555561).

Almost surely, 2^{22012221111121} is an apocalyptic number.

It is an amenable number.

22012221111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22012221111121 is an equidigital number, since it uses as much as digits as its factorization.

22012221111121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 22012221111121 its reverse (12111112221022), we get a palindrome (34123333332143).

The spelling of 22012221111121 in words is "twenty-two trillion, twelve billion, two hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".