103213021 has 4 divisors (see below), whose sum is σ = 104626972. Its totient is φ = 101799072.

The previous prime is 103213009. The next prime is 103213039. The reversal of 103213021 is 120312301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120312301 = 97 ⋅1240333.

It can be written as a sum of positive squares in 2 ways, for example, as 41024025 + 62188996 = 6405^2 + 7886^2 .

It is a cyclic number.

It is not a de Polignac number, because 103213021 - 2¹¹ = 103210973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103212992 and 103213010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103213051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706866 + ... + 707011.

It is an arithmetic number, because the mean of its divisors is an integer number (26156743).

Almost surely, 2^103213021 is an apocalyptic number.

It is an amenable number.

103213021 is a deficient number, since it is larger than the sum of its proper divisors (1413951).

103213021 is an equidigital number, since it uses as much as digits as its factorization.

103213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413950.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 103213021 is about 10159.3809358642. The cubic root of 103213021 is about 469.0777463504.

Adding to 103213021 its reverse (120312301), we get a palindrome (223525322).

The spelling of 103213021 in words is "one hundred three million, two hundred thirteen thousand, twenty-one".