10018421 has 4 divisors (see below), whose sum is σ = 11449632. Its totient is φ = 8587212.

The previous prime is 10018357. The next prime is 10018429. The reversal of 10018421 is 12481001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12481001 = 13 ⋅960077.

It is a cyclic number.

It is not a de Polignac number, because 10018421 - 2⁶ = 10018357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10018421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10018429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715595 + ... + 715608.

It is an arithmetic number, because the mean of its divisors is an integer number (2862408).

Almost surely, 2^10018421 is an apocalyptic number.

It is an amenable number.

10018421 is a deficient number, since it is larger than the sum of its proper divisors (1431211).

10018421 is an equidigital number, since it uses as much as digits as its factorization.

10018421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431210.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 10018421 is about 3165.1889359089. The cubic root of 10018421 is about 215.5756773275.

Adding to 10018421 its reverse (12481001), we get a palindrome (22499422).

The spelling of 10018421 in words is "ten million, eighteen thousand, four hundred twenty-one".