2421531 has 54 divisors (see below), whose sum is σ = 4549740. Its totient is φ = 1233792.

The previous prime is 2421527. The next prime is 2421533. The reversal of 2421531 is 1351242.

It is not a de Polignac number, because 2421531 - 2² = 2421527 is a prime.

It is a super-2 number, since 2×2421531² = 11727624767922, which contains 22 as substring.

2421531 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2421533) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 127440 + ... + 127458.

2^2421531 is an apocalyptic number.

2421531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2421531 is a deficient number, since it is larger than the sum of its proper divisors (2128209).

2421531 is a wasteful number, since it uses less digits than its factorization.

2421531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 46 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2421531 is about 1556.1269228440. The cubic root of 2421531 is about 134.2857753454.

Adding to 2421531 its reverse (1351242), we get a palindrome (3772773).

The spelling of 2421531 in words is "two million, four hundred twenty-one thousand, five hundred thirty-one".