2731421 has 16 divisors (see below), whose sum is σ = 3586560. Its totient is φ = 2015280.

The previous prime is 2731381. The next prime is 2731427. The reversal of 2731421 is 1241372.

It is a cyclic number.

It is not a de Polignac number, because 2731421 - 2⁶ = 2731357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2731393 and 2731402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2731427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530 + ... + 2396.

It is an arithmetic number, because the mean of its divisors is an integer number (224160).

2^2731421 is an apocalyptic number.

It is an amenable number.

2731421 is a deficient number, since it is larger than the sum of its proper divisors (855139).

2731421 is a wasteful number, since it uses less digits than its factorization.

2731421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904.

The product of its digits is 336, while the sum is 20.

The square root of 2731421 is about 1652.7011224054. The cubic root of 2731421 is about 139.7857436975.

Adding to 2731421 its reverse (1241372), we get a palindrome (3972793).

The spelling of 2731421 in words is "two million, seven hundred thirty-one thousand, four hundred twenty-one".