1211012232121 has 2 divisors, whose sum is σ = 1211012232122. Its totient is φ = 1211012232120.

The previous prime is 1211012232109. The next prime is 1211012232167. The reversal of 1211012232121 is 1212322101121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676744796025 + 534267436096 = 822645^2 + 730936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211012232121 - 2¹⁷ = 1211012101049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211012232191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605506116060 + 605506116061.

It is an arithmetic number, because the mean of its divisors is an integer number (605506116061).

Almost surely, 2^{1211012232121} is an apocalyptic number.

It is an amenable number.

1211012232121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211012232121 is an equidigital number, since it uses as much as digits as its factorization.

1211012232121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1211012232121 its reverse (1212322101121), we get a palindrome (2423334333242).

The spelling of 1211012232121 in words is "one trillion, two hundred eleven billion, twelve million, two hundred thirty-two thousand, one hundred twenty-one".