1281141227521 has 4 divisors (see below), whose sum is σ = 1348569713200. Its totient is φ = 1213712741844.

The previous prime is 1281141227467. The next prime is 1281141227551. The reversal of 1281141227521 is 1257221411821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1281141227521 - 2³¹ = 1278993743873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281141227551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33714242811 + ... + 33714242848.

It is an arithmetic number, because the mean of its divisors is an integer number (337142428300).

Almost surely, 2^{1281141227521} is an apocalyptic number.

It is an amenable number.

1281141227521 is a deficient number, since it is larger than the sum of its proper divisors (67428485679).

1281141227521 is an equidigital number, since it uses as much as digits as its factorization.

1281141227521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67428485678.

The product of its digits is 17920, while the sum is 37.

The spelling of 1281141227521 in words is "one trillion, two hundred eighty-one billion, one hundred forty-one million, two hundred twenty-seven thousand, five hundred twenty-one".