10506554221 has 4 divisors (see below), whose sum is σ = 10512244512. Its totient is φ = 10500863932.

The previous prime is 10506554213. The next prime is 10506554237. The reversal of 10506554221 is 12245560501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12245560501 = 15937 ⋅768373.

It is a cyclic number.

It is not a de Polignac number, because 10506554221 - 2³ = 10506554213 is a prime.

It is a super-2 number, since 2×10506554221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10506554291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842375 + ... + 2846068.

It is an arithmetic number, because the mean of its divisors is an integer number (2628061128).

Almost surely, 2^10506554221 is an apocalyptic number.

It is an amenable number.

10506554221 is a deficient number, since it is larger than the sum of its proper divisors (5690291).

10506554221 is an equidigital number, since it uses as much as digits as its factorization.

10506554221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690290.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 10506554221 in words is "ten billion, five hundred six million, five hundred fifty-four thousand, two hundred twenty-one".