10212421 has 2 divisors, whose sum is σ = 10212422. Its totient is φ = 10212420.

The previous prime is 10212373. The next prime is 10212431. The reversal of 10212421 is 12421201.

It is a happy number.

10212421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 4972900 = 2289^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212421 - 2⁹ = 10211909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106210 + 5106211.

It is an arithmetic number, because the mean of its divisors is an integer number (5106211).

Almost surely, 2^10212421 is an apocalyptic number.

It is an amenable number.

10212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212421 is an equidigital number, since it uses as much as digits as its factorization.

10212421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 10212421 is about 3195.6878758727. The cubic root of 10212421 is about 216.9582837264.

Adding to 10212421 its reverse (12421201), we get a palindrome (22633622).

The spelling of 10212421 in words is "ten million, two hundred twelve thousand, four hundred twenty-one".