1211421133121 has 2 divisors, whose sum is σ = 1211421133122. Its totient is φ = 1211421133120.

The previous prime is 1211421133103. The next prime is 1211421133163. The reversal of 1211421133121 is 1213311241121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974119650625 + 237301482496 = 986975^2 + 487136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211421133121 is a prime.

It is a super-3 number, since 3×1211421133121³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1211421130121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605710566560 + 605710566561.

It is an arithmetic number, because the mean of its divisors is an integer number (605710566561).

Almost surely, 2^{1211421133121} is an apocalyptic number.

It is an amenable number.

1211421133121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211421133121 is an equidigital number, since it uses as much as digits as its factorization.

1211421133121 is an evil number, because the sum of its binary digits is even.

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

Adding to 1211421133121 its reverse (1213311241121), we get a palindrome (2424732374242).

The spelling of 1211421133121 in words is "one trillion, two hundred eleven billion, four hundred twenty-one million, one hundred thirty-three thousand, one hundred twenty-one".