10500999221 has 4 divisors (see below), whose sum is σ = 10505695692. Its totient is φ = 10496302752.

The previous prime is 10500999217. The next prime is 10500999283. The reversal of 10500999221 is 12299900501.

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 4239442321 + 6261556900 = 65111^2 + 79130^2 .

It is a cyclic number.

It is not a de Polignac number, because 10500999221 - 2² = 10500999217 is a prime.

It is a super-2 number, since 2×10500999221² (a number of 21 digits) contains 22 as substring.

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 (10500939221) 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, 2344880 + ... + 2349353.

It is an arithmetic number, because the mean of its divisors is an integer number (2626423923).

Almost surely, 2^10500999221 is an apocalyptic number.

It is an amenable number.

10500999221 is a deficient number, since it is larger than the sum of its proper divisors (4696471).

10500999221 is an equidigital number, since it uses as much as digits as its factorization.

10500999221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696470.

The product of its (nonzero) digits is 14580, while the sum is 38.

The spelling of 10500999221 in words is "ten billion, five hundred million, nine hundred ninety-nine thousand, two hundred twenty-one".