103646021 has 4 divisors (see below), whose sum is σ = 104437344. Its totient is φ = 102854700.

The previous prime is 103646017. The next prime is 103646033. The reversal of 103646021 is 120646301.

It is a happy number.

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: 120646301 = 139 ⋅867959.

It is a cyclic number.

It is not a de Polignac number, because 103646021 - 2² = 103646017 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 (103646041) 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, 395465 + ... + 395726.

It is an arithmetic number, because the mean of its divisors is an integer number (26109336).

Almost surely, 2^103646021 is an apocalyptic number.

It is an amenable number.

103646021 is a deficient number, since it is larger than the sum of its proper divisors (791323).

103646021 is an equidigital number, since it uses as much as digits as its factorization.

103646021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791322.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 103646021 is about 10180.6689858771. The cubic root of 103646021 is about 469.7327906200.

The spelling of 103646021 in words is "one hundred three million, six hundred forty-six thousand, twenty-one".