1421421 has 16 divisors (see below), whose sum is σ = 2052864. Its totient is φ = 871424.

The previous prime is 1421417. The next prime is 1421437. The reversal of 1421421 is 1241241.

It is a cyclic number.

It is not a de Polignac number, because 1421421 - 2² = 1421417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421401) 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 15 ways as a sum of consecutive naturals, for example, 2101 + ... + 2693.

It is an arithmetic number, because the mean of its divisors is an integer number (128304).

2^1421421 is an apocalyptic number.

It is an amenable number.

1421421 is a deficient number, since it is larger than the sum of its proper divisors (631443).

1421421 is a wasteful number, since it uses less digits than its factorization.

1421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 64, while the sum is 15.

The square root of 1421421 is about 1192.2336180464. The cubic root of 1421421 is about 112.4365667089.

Adding to 1421421 its reverse (1241241), we get a palindrome (2662662).

The spelling of 1421421 in words is "one million, four hundred twenty-one thousand, four hundred twenty-one".