10506421 has 2 divisors, whose sum is σ = 10506422. Its totient is φ = 10506420.

The previous prime is 10506407. The next prime is 10506451. The reversal of 10506421 is 12460501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 828100 = 3111^2 + 910^2 .

It is an emirp because it is prime and its reverse (12460501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10506421 - 2⁹ = 10505909 is a prime.

It is a super-2 number, since 2×10506421² = 220769764458482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10506451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253210 + 5253211.

It is an arithmetic number, because the mean of its divisors is an integer number (5253211).

Almost surely, 2^10506421 is an apocalyptic number.

It is an amenable number.

10506421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10506421 is an equidigital number, since it uses as much as digits as its factorization.

10506421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 10506421 is about 3241.3609795887. The cubic root of 10506421 is about 219.0205842359.

Adding to 10506421 its reverse (12460501), we get a palindrome (22966922).

The spelling of 10506421 in words is "ten million, five hundred six thousand, four hundred twenty-one".