1221511352141 has 2 divisors, whose sum is σ = 1221511352142. Its totient is φ = 1221511352140.

The previous prime is 1221511352123. The next prime is 1221511352143. The reversal of 1221511352141 is 1412531151221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200788598025 + 20722754116 = 1095805^2 + 143954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221511352141 is a prime.

Together with 1221511352143, 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 (1221511352143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610755676070 + 610755676071.

It is an arithmetic number, because the mean of its divisors is an integer number (610755676071).

Almost surely, 2^{1221511352141} is an apocalyptic number.

It is an amenable number.

1221511352141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221511352141 is an equidigital number, since it uses as much as digits as its factorization.

1221511352141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 29.

The spelling of 1221511352141 in words is "one trillion, two hundred twenty-one billion, five hundred eleven million, three hundred fifty-two thousand, one hundred forty-one".