1281480519421 has 4 divisors (see below), whose sum is σ = 1316115128092. Its totient is φ = 1246845910752.

The previous prime is 1281480519409. The next prime is 1281480519443. The reversal of 1281480519421 is 1249150841821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 774734436100 + 506746083321 = 880190^2 + 711861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281480519421 - 2⁹ = 1281480518909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281480519461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17317304280 + ... + 17317304353.

It is an arithmetic number, because the mean of its divisors is an integer number (329028782023).

Almost surely, 2^{1281480519421} is an apocalyptic number.

It is an amenable number.

1281480519421 is a deficient number, since it is larger than the sum of its proper divisors (34634608671).

1281480519421 is an equidigital number, since it uses as much as digits as its factorization.

1281480519421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34634608670.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 1281480519421 in words is "one trillion, two hundred eighty-one billion, four hundred eighty million, five hundred nineteen thousand, four hundred twenty-one".