10020021 has 32 divisors (see below), whose sum is σ = 15769728. Its totient is φ = 5591040.

The previous prime is 10020013. The next prime is 10020041. The reversal of 10020021 is 12002001.

It is a happy number.

10020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10020021 - 2³ = 10020013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10019991 and 10020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29565 + ... + 29901.

It is an arithmetic number, because the mean of its divisors is an integer number (492804).

Almost surely, 2^10020021 is an apocalyptic number.

10020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10020021 is a deficient number, since it is larger than the sum of its proper divisors (5749707).

10020021 is a wasteful number, since it uses less digits than its factorization.

10020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 10020021 is about 3165.4416753433. The cubic root of 10020021 is about 215.5871529457.

Adding to 10020021 its reverse (12002001), we get a palindrome (22022022).

The spelling of 10020021 in words is "ten million, twenty thousand, twenty-one".