10216021 has 2 divisors, whose sum is σ = 10216022. Its totient is φ = 10216020.

The previous prime is 10216013. The next prime is 10216051. The reversal of 10216021 is 12061201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 2515396 = 2775^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 10216021 - 2³ = 10216013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10215992 and 10216010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10216051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5108010 + 5108011.

It is an arithmetic number, because the mean of its divisors is an integer number (5108011).

Almost surely, 2^10216021 is an apocalyptic number.

It is an amenable number.

10216021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10216021 is an equidigital number, since it uses as much as digits as its factorization.

10216021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 10216021 is about 3196.2510852560. The cubic root of 10216021 is about 216.9837741908.

Adding to 10216021 its reverse (12061201), we get a palindrome (22277222).

The spelling of 10216021 in words is "ten million, two hundred sixteen thousand, twenty-one".