1200911331321 has 27 divisors (see below), whose sum is σ = 1878415342479. Its totient is φ = 738996057072.

The previous prime is 1200911331251. The next prime is 1200911331331. The reversal of 1200911331321 is 1231331190021.

The square root of 1200911331321 is 1095861.

It is a perfect power (a square), and thus also a powerful number.

1200911331321 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 9 + 1 + 1 + 331 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 177649605225 + 1023261726096 = 421485^2 + 1011564^2 .

It is not a de Polignac number, because 1200911331321 - 2⁹ = 1200911330809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200911331331) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 42724530 + ... + 42752628.

Almost surely, 2^{1200911331321} is an apocalyptic number.

1200911331321 is the 1095861-st square number.

1200911331321 is the 547931-st centered octagonal number.

It is an amenable number.

1200911331321 is a deficient number, since it is larger than the sum of its proper divisors (677504011158).

1200911331321 is an frugal number, since it uses more digits than its factorization.

1200911331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56230 (or 28115 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 1200911331321 in words is "one trillion, two hundred billion, nine hundred eleven million, three hundred thirty-one thousand, three hundred twenty-one".