1293486978721 has 32 divisors (see below), whose sum is σ = 1539724492800. Its totient is φ = 1063553996736.

The previous prime is 1293486978691. The next prime is 1293486978821. The reversal of 1293486978721 is 1278796843921.

It is not a de Polignac number, because 1293486978721 - 2³³ = 1284897044129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1293486978821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5948880 + ... + 6162478.

It is an arithmetic number, because the mean of its divisors is an integer number (48116390400).

Almost surely, 2^{1293486978721} is an apocalyptic number.

It is an amenable number.

1293486978721 is a deficient number, since it is larger than the sum of its proper divisors (246237514079).

1293486978721 is a wasteful number, since it uses less digits than its factorization.

1293486978721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213973.

The product of its digits is 73156608, while the sum is 67.

The spelling of 1293486978721 in words is "one trillion, two hundred ninety-three billion, four hundred eighty-six million, nine hundred seventy-eight thousand, seven hundred twenty-one".