2431221 has 32 divisors (see below), whose sum is σ = 3911040. Its totient is φ = 1327104.

The previous prime is 2431217. The next prime is 2431223. The reversal of 2431221 is 1221342.

2431221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2431221 - 2² = 2431217 is a prime.

2431221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2431221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2431223) 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 31 ways as a sum of consecutive naturals, for example, 12501 + ... + 12693.

It is an arithmetic number, because the mean of its divisors is an integer number (122220).

2^2431221 is an apocalyptic number.

It is an amenable number.

2431221 is a deficient number, since it is larger than the sum of its proper divisors (1479819).

2431221 is a wasteful number, since it uses less digits than its factorization.

2431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245.

The product of its digits is 96, while the sum is 15.

The square root of 2431221 is about 1559.2373135607. The cubic root of 2431221 is about 134.4646563020.

Adding to 2431221 its reverse (1221342), we get a palindrome (3652563).

The spelling of 2431221 in words is "two million, four hundred thirty-one thousand, two hundred twenty-one".