108403021 has 4 divisors (see below), whose sum is σ = 108454432. Its totient is φ = 108351612.

The previous prime is 108403003. The next prime is 108403027. The reversal of 108403021 is 120304801.

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: 120304801 = 17 ⋅7076753.

It is a cyclic number.

It is not a de Polignac number, because 108403021 - 2⁹ = 108402509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108403021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108403027) 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, 22401 + ... + 26806.

It is an arithmetic number, because the mean of its divisors is an integer number (27113608).

Almost surely, 2^108403021 is an apocalyptic number.

It is an amenable number.

108403021 is a deficient number, since it is larger than the sum of its proper divisors (51411).

108403021 is an equidigital number, since it uses as much as digits as its factorization.

108403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51410.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 108403021 is about 10411.6771463583. The cubic root of 108403021 is about 476.8119469032.

Adding to 108403021 its reverse (120304801), we get a palindrome (228707822).

It can be divided in two parts, 10840 and 3021, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 108403021 in words is "one hundred eight million, four hundred three thousand, twenty-one".