1212212202121 has 2 divisors, whose sum is σ = 1212212202122. Its totient is φ = 1212212202120.

The previous prime is 1212212202101. The next prime is 1212212202143. The reversal of 1212212202121 is 1212022122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764162698896 + 448049503225 = 874164^2 + 669365^2 .

It is an emirp because it is prime and its reverse (1212022122121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212212202121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212212202101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606106101060 + 606106101061.

It is an arithmetic number, because the mean of its divisors is an integer number (606106101061).

Almost surely, 2^{1212212202121} is an apocalyptic number.

It is an amenable number.

1212212202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212212202121 is an equidigital number, since it uses as much as digits as its factorization.

1212212202121 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 19.

Adding to 1212212202121 its reverse (1212022122121), we get a palindrome (2424234324242).

The spelling of 1212212202121 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred two thousand, one hundred twenty-one".