1212100210121 has 2 divisors, whose sum is σ = 1212100210122. Its totient is φ = 1212100210120.

The previous prime is 1212100210109. The next prime is 1212100210133. The reversal of 1212100210121 is 1210120012121.

It is a balanced prime because it is at equal distance from previous prime (1212100210109) and next prime (1212100210133).

It can be written as a sum of positive squares in only one way, i.e., 1020837433225 + 191262776896 = 1010365^2 + 437336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212100210121 - 2¹⁸ = 1212099947977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212100210096 and 1212100210105.

It is not a weakly prime, because it can be changed into another prime (1212100410121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606050105060 + 606050105061.

It is an arithmetic number, because the mean of its divisors is an integer number (606050105061).

Almost surely, 2^{1212100210121} is an apocalyptic number.

It is an amenable number.

1212100210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212100210121 is an equidigital number, since it uses as much as digits as its factorization.

1212100210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212100210121 its reverse (1210120012121), we get a palindrome (2422220222242).

The spelling of 1212100210121 in words is "one trillion, two hundred twelve billion, one hundred million, two hundred ten thousand, one hundred twenty-one".