103215421 has 4 divisors (see below), whose sum is σ = 107703072. Its totient is φ = 98727772.

The previous prime is 103215419. The next prime is 103215457. The reversal of 103215421 is 124512301.

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.

It is a cyclic number.

It is not a de Polignac number, because 103215421 - 2¹ = 103215419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103215121) 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, 2243791 + ... + 2243836.

It is an arithmetic number, because the mean of its divisors is an integer number (26925768).

Almost surely, 2^103215421 is an apocalyptic number.

It is an amenable number.

103215421 is a deficient number, since it is larger than the sum of its proper divisors (4487651).

103215421 is an equidigital number, since it uses as much as digits as its factorization.

103215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4487650.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 103215421 is about 10159.4990526108. The cubic root of 103215421 is about 469.0813821251.

Adding to 103215421 its reverse (124512301), we get a palindrome (227727722).

The spelling of 103215421 in words is "one hundred three million, two hundred fifteen thousand, four hundred twenty-one".