10128421 has 2 divisors, whose sum is σ = 10128422. Its totient is φ = 10128420.

The previous prime is 10128409. The next prime is 10128427. The reversal of 10128421 is 12482101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 3441025 = 2586^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 10128421 - 2¹⁵ = 10095653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10128427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064210 + 5064211.

It is an arithmetic number, because the mean of its divisors is an integer number (5064211).

Almost surely, 2^10128421 is an apocalyptic number.

It is an amenable number.

10128421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10128421 is an equidigital number, since it uses as much as digits as its factorization.

10128421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 10128421 is about 3182.5180282286. The cubic root of 10128421 is about 216.3617979175.

The spelling of 10128421 in words is "ten million, one hundred twenty-eight thousand, four hundred twenty-one".