12101221222121 has 2 divisors, whose sum is σ = 12101221222122. Its totient is φ = 12101221222120.

The previous prime is 12101221222021. The next prime is 12101221222127. The reversal of 12101221222121 is 12122212210121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9819417624025 + 2281803598096 = 3133595^2 + 1510564^2 .

It is a cyclic number.

It is not a de Polignac number, because 12101221222121 - 2³⁴ = 12084041352937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101221222093 and 12101221222102.

It is not a weakly prime, because it can be changed into another prime (12101221222127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050610611060 + 6050610611061.

It is an arithmetic number, because the mean of its divisors is an integer number (6050610611061).

Almost surely, 2^{12101221222121} is an apocalyptic number.

It is an amenable number.

12101221222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101221222121 is an equidigital number, since it uses as much as digits as its factorization.

12101221222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12101221222121 its reverse (12122212210121), we get a palindrome (24223433432242).

The spelling of 12101221222121 in words is "twelve trillion, one hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".