10172909221 has 4 divisors (see below), whose sum is σ = 10218527872. Its totient is φ = 10127290572.

The previous prime is 10172909207. The next prime is 10172909261. The reversal of 10172909221 is 12290927101.

It is a happy number.

10172909221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 12290927101 = 131 ⋅93823871.

It is a cyclic number.

It is not a de Polignac number, because 10172909221 - 2⁵ = 10172909189 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 (10172909261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22808991 + ... + 22809436.

It is an arithmetic number, because the mean of its divisors is an integer number (2554631968).

Almost surely, 2^10172909221 is an apocalyptic number.

It is an amenable number.

10172909221 is a deficient number, since it is larger than the sum of its proper divisors (45618651).

10172909221 is an equidigital number, since it uses as much as digits as its factorization.

10172909221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45618650.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 10172909221 in words is "ten billion, one hundred seventy-two million, nine hundred nine thousand, two hundred twenty-one".