11206551321 has 45 divisors (see below), whose sum is σ = 19099056405. Its totient is φ = 6313550040.

The previous prime is 11206551311. The next prime is 11206551337. The reversal of 11206551321 is 12315560211.

The square root of 11206551321 is 105861.

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

11206551321 is a `hidden beast` number, since 1 + 1 + 2 + 0 + 655 + 1 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 11206551321 - 2⁷ = 11206551193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11206551311) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 157838716 + ... + 157838786.

Almost surely, 2^11206551321 is an apocalyptic number.

11206551321 is the 105861-st square number.

11206551321 is the 52931-st centered octagonal number.

It is an amenable number.

11206551321 is a deficient number, since it is larger than the sum of its proper divisors (7892505084).

11206551321 is an frugal number, since it uses more digits than its factorization.

11206551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 11206551321 in words is "eleven billion, two hundred six million, five hundred fifty-one thousand, three hundred twenty-one".