10020421 has 4 divisors (see below), whose sum is σ = 10133100. Its totient is φ = 9907744.

The previous prime is 10020407. The next prime is 10020431. The reversal of 10020421 is 12402001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12402001 = 1471 ⋅8431.

It can be written as a sum of positive squares in 2 ways, for example, as 3944196 + 6076225 = 1986^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 10020421 - 2⁵ = 10020389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10020398 and 10020407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56206 + ... + 56383.

It is an arithmetic number, because the mean of its divisors is an integer number (2533275).

Almost surely, 2^10020421 is an apocalyptic number.

It is an amenable number.

10020421 is a deficient number, since it is larger than the sum of its proper divisors (112679).

10020421 is an equidigital number, since it uses as much as digits as its factorization.

10020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112678.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 10020421 is about 3165.5048570489. The cubic root of 10020421 is about 215.5900216594.

Adding to 10020421 its reverse (12402001), we get a palindrome (22422422).

The spelling of 10020421 in words is "ten million, twenty thousand, four hundred twenty-one".