103000000021 has 4 divisors (see below), whose sum is σ = 103019778700. Its totient is φ = 102980221344.

The previous prime is 103000000013. The next prime is 103000000039. The reversal of 103000000021 is 120000000301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120000000301 = 311 ⋅385852091.

It can be written as a sum of positive squares in 2 ways, for example, as 76986826225 + 26013173796 = 277465^2 + 161286^2 .

It is a cyclic number.

It is not a de Polignac number, because 103000000021 - 2³ = 103000000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102999999950 and 103000000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103000000091) 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, 9881526 + ... + 9891943.

It is an arithmetic number, because the mean of its divisors is an integer number (25754944675).

Almost surely, 2^103000000021 is an apocalyptic number.

It is an amenable number.

103000000021 is a deficient number, since it is larger than the sum of its proper divisors (19778679).

103000000021 is an equidigital number, since it uses as much as digits as its factorization.

103000000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19778678.

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

Adding to 103000000021 its reverse (120000000301), we get a palindrome (223000000322).

The spelling of 103000000021 in words is "one hundred three billion, twenty-one", and thus it is an aban number.