1421 has 6 divisors (see below), whose sum is σ = 1710. Its totient is φ = 1176.

The previous prime is 1409. The next prime is 1423. The reversal of 1421 is 1241.

1421 is nontrivially palindromic in base 2 and base 14.

It can be written as a sum of positive squares in only one way, i.e., 1225 + 196 = 35^2 + 14^2 .

It is not a de Polignac number, because 1421 - 2¹⁰ = 397 is a prime.

It is a Duffinian number.

1421 is an undulating number in base 14.

1421 is a modest number, since divided by 21 gives 14 as remainder.

It is a Curzon number.

It is a plaindrome in base 16.

It is a nialpdrome in base 7 and base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1399 and 1408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35 + ... + 63.

It is an arithmetic number, because the mean of its divisors is an integer number (285).

2¹⁴²¹ is an apocalyptic number.

It is an amenable number.

1421 is a deficient number, since it is larger than the sum of its proper divisors (289).

1421 is an equidigital number, since it uses as much as digits as its factorization.

1421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43 (or 36 counting only the distinct ones).

The product of its digits is 8, while the sum is 8.

The square root of 1421 is about 37.6961536499. The cubic root of 1421 is about 11.2425465032.

Adding to 1421 its reverse (1241), we get a palindrome (2662).

The spelling of 1421 in words is "one thousand, four hundred twenty-one", and thus it is an iban number.