103191921 has 32 divisors (see below), whose sum is σ = 184999680. Its totient is φ = 55496448.

The previous prime is 103191919. The next prime is 103191923. The reversal of 103191921 is 129191301.

It is an interprime number because it is at equal distance from previous prime (103191919) and next prime (103191923).

It is not a de Polignac number, because 103191921 - 2¹ = 103191919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (103191923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12846 + ... + 19271.

It is an arithmetic number, because the mean of its divisors is an integer number (5781240).

Almost surely, 2^103191921 is an apocalyptic number.

It is an amenable number.

103191921 is a deficient number, since it is larger than the sum of its proper divisors (81807759).

103191921 is a wasteful number, since it uses less digits than its factorization.

103191921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32150 (or 32144 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 103191921 is about 10158.3424336847. The cubic root of 103191921 is about 469.0457794051.

The spelling of 103191921 in words is "one hundred three million, one hundred ninety-one thousand, nine hundred twenty-one".