103231821 has 16 divisors (see below), whose sum is σ = 171606528. Its totient is φ = 53626800.

The previous prime is 103231801. The next prime is 103231841. The reversal of 103231821 is 128132301.

It is an interprime number because it is at equal distance from previous prime (103231801) and next prime (103231841).

It is not a de Polignac number, because 103231821 - 2⁵ = 103231789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103231801) 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 15 ways as a sum of consecutive naturals, for example, 223215 + ... + 223676.

It is an arithmetic number, because the mean of its divisors is an integer number (10725408).

Almost surely, 2^103231821 is an apocalyptic number.

103231821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

103231821 is a deficient number, since it is larger than the sum of its proper divisors (68374707).

103231821 is a wasteful number, since it uses less digits than its factorization.

103231821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446912.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 103231821 is about 10160.3061469623. The cubic root of 103231821 is about 469.1062250771.

The spelling of 103231821 in words is "one hundred three million, two hundred thirty-one thousand, eight hundred twenty-one".