1131320778921 has 24 divisors (see below), whose sum is σ = 1730303194464. Its totient is φ = 709828686720.

The previous prime is 1131320778901. The next prime is 1131320778923. The reversal of 1131320778921 is 1298770231311.

It is not a de Polignac number, because 1131320778921 - 2¹³ = 1131320770729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131320778923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7091766 + ... + 7249536.

It is an arithmetic number, because the mean of its divisors is an integer number (72095966436).

Almost surely, 2^{1131320778921} is an apocalyptic number.

It is an amenable number.

1131320778921 is a deficient number, since it is larger than the sum of its proper divisors (598982415543).

1131320778921 is a wasteful number, since it uses less digits than its factorization.

1131320778921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204661 (or 204658 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 1131320778921 in words is "one trillion, one hundred thirty-one billion, three hundred twenty million, seven hundred seventy-eight thousand, nine hundred twenty-one".