1211232121061 has 2 divisors, whose sum is σ = 1211232121062. Its totient is φ = 1211232121060.

The previous prime is 1211232121009. The next prime is 1211232121063. The reversal of 1211232121061 is 1601212321121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881193360961 + 330038760100 = 938719^2 + 574490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211232121061 is a prime.

Together with 1211232121063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211232121063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605616060530 + 605616060531.

It is an arithmetic number, because the mean of its divisors is an integer number (605616060531).

Almost surely, 2^{1211232121061} is an apocalyptic number.

It is an amenable number.

1211232121061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211232121061 is an equidigital number, since it uses as much as digits as its factorization.

1211232121061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 1211232121061 its reverse (1601212321121), we get a palindrome (2812444442182).

The spelling of 1211232121061 in words is "one trillion, two hundred eleven billion, two hundred thirty-two million, one hundred twenty-one thousand, sixty-one".