103000021 has 4 divisors (see below), whose sum is σ = 103295500. Its totient is φ = 102704544.

The previous prime is 102999979. The next prime is 103000039. The reversal of 103000021 is 120000301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53085796 + 49914225 = 7286^2 + 7065^2 .

It is a cyclic number.

It is not a de Polignac number, because 103000021 - 2⁹ = 102999509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102999968 and 103000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103000091) 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, 147216 + ... + 147913.

It is an arithmetic number, because the mean of its divisors is an integer number (25823875).

Almost surely, 2^103000021 is an apocalyptic number.

It is an amenable number.

103000021 is a deficient number, since it is larger than the sum of its proper divisors (295479).

103000021 is an equidigital number, since it uses as much as digits as its factorization.

103000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295478.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 103000021 is about 10148.8925996879. The cubic root of 103000021 is about 468.7548466225.

Adding to 103000021 its reverse (120000301), we get a palindrome (223000322).

The spelling of 103000021 in words is "one hundred three million, twenty-one", and thus it is an aban number.