11706567221 has 4 divisors (see below), whose sum is σ = 11708087244. Its totient is φ = 11705047200.

The previous prime is 11706567181. The next prime is 11706567241. The reversal of 11706567221 is 12276560711.

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 701508196 + 11005059025 = 26486^2 + 104905^2 .

It is a cyclic number.

It is not a de Polignac number, because 11706567221 - 2¹⁴ = 11706550837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11706567241) 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, 748400 + ... + 763881.

It is an arithmetic number, because the mean of its divisors is an integer number (2927021811).

Almost surely, 2^11706567221 is an apocalyptic number.

It is an amenable number.

11706567221 is a deficient number, since it is larger than the sum of its proper divisors (1520023).

11706567221 is an equidigital number, since it uses as much as digits as its factorization.

11706567221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520022.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 11706567221 in words is "eleven billion, seven hundred six million, five hundred sixty-seven thousand, two hundred twenty-one".