10001421 has 8 divisors (see below), whose sum is σ = 14816960. Its totient is φ = 6667596.

The previous prime is 10001419. The next prime is 10001441. The reversal of 10001421 is 12410001.

It is a happy number.

It is not a de Polignac number, because 10001421 - 2¹ = 10001419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185185 + ... + 185238.

It is an arithmetic number, because the mean of its divisors is an integer number (1852120).

Almost surely, 2^10001421 is an apocalyptic number.

It is an amenable number.

10001421 is a deficient number, since it is larger than the sum of its proper divisors (4815539).

10001421 is an equidigital number, since it uses as much as digits as its factorization.

10001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370432 (or 370426 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 10001421 is about 3162.5023320150. The cubic root of 10001421 is about 215.4536733588.

Adding to 10001421 its reverse (12410001), we get a palindrome (22411422).

The spelling of 10001421 in words is "ten million, one thousand, four hundred twenty-one".