10215421 has 2 divisors, whose sum is σ = 10215422. Its totient is φ = 10215420.

The previous prime is 10215389. The next prime is 10215431. The reversal of 10215421 is 12451201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10208025 + 7396 = 3195^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 10215421 - 2⁵ = 10215389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10215395 and 10215404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10215431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5107710 + 5107711.

It is an arithmetic number, because the mean of its divisors is an integer number (5107711).

Almost surely, 2^10215421 is an apocalyptic number.

It is an amenable number.

10215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10215421 is an equidigital number, since it uses as much as digits as its factorization.

10215421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 10215421 is about 3196.1572239175. The cubic root of 10215421 is about 216.9795261960.

Adding to 10215421 its reverse (12451201), we get a palindrome (22666622).

The spelling of 10215421 in words is "ten million, two hundred fifteen thousand, four hundred twenty-one".