10811658521221 has 8 divisors (see below), whose sum is σ = 11447667598680. Its totient is φ = 10175652684288.

The previous prime is 10811658521201. The next prime is 10811658521281. The reversal of 10811658521221 is 12212585611801.

It can be written as a sum of positive squares in 4 ways, for example, as 3377365493121 + 7434293028100 = 1837761^2 + 2726590^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10811658521221 - 2¹⁷ = 10811658390149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10811658521201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10872475 + ... + 11825143.

It is an arithmetic number, because the mean of its divisors is an integer number (1430958449835).

Almost surely, 2^{10811658521221} is an apocalyptic number.

It is an amenable number.

10811658521221 is a deficient number, since it is larger than the sum of its proper divisors (636009077459).

10811658521221 is an equidigital number, since it uses as much as digits as its factorization.

10811658521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620263.

The product of its (nonzero) digits is 76800, while the sum is 43.

The spelling of 10811658521221 in words is "ten trillion, eight hundred eleven billion, six hundred fifty-eight million, five hundred twenty-one thousand, two hundred twenty-one".