1331421 has 16 divisors (see below), whose sum is σ = 2185344. Its totient is φ = 702144.

The previous prime is 1331411. The next prime is 1331431. The reversal of 1331421 is 1241331.

It is an interprime number because it is at equal distance from previous prime (1331411) and next prime (1331431).

It is not a de Polignac number, because 1331421 - 2⁷ = 1331293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2166 + ... + 2711.

It is an arithmetic number, because the mean of its divisors is an integer number (136584).

2^1331421 is an apocalyptic number.

It is an amenable number.

1331421 is a deficient number, since it is larger than the sum of its proper divisors (853923).

1331421 is a wasteful number, since it uses less digits than its factorization.

1331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900.

The product of its digits is 72, while the sum is 15.

The square root of 1331421 is about 1153.8721766296. The cubic root of 1331421 is about 110.0115965736.

Adding to 1331421 its reverse (1241331), we get a palindrome (2572752).

The spelling of 1331421 in words is "one million, three hundred thirty-one thousand, four hundred twenty-one".