10018021 has 8 divisors (see below), whose sum is σ = 11161080. Its totient is φ = 8928192.

The previous prime is 10017989. The next prime is 10018027. The reversal of 10018021 is 12081001.

It can be written as a sum of positive squares in 4 ways, for example, as 3101121 + 6916900 = 1761^2 + 2630^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10018021 - 2⁵ = 10017989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10017992 and 10018010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10018027) 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 in 7 ways as a sum of consecutive naturals, for example, 12910 + ... + 13663.

It is an arithmetic number, because the mean of its divisors is an integer number (1395135).

Almost surely, 2^10018021 is an apocalyptic number.

It is an amenable number.

10018021 is a deficient number, since it is larger than the sum of its proper divisors (1143059).

10018021 is a wasteful number, since it uses less digits than its factorization.

10018021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26615.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 10018021 is about 3165.1257478969. The cubic root of 10018021 is about 215.5728082320.

Adding to 10018021 its reverse (12081001), we get a palindrome (22099022).

The spelling of 10018021 in words is "ten million, eighteen thousand, twenty-one".