2421551 has 4 divisors (see below), whose sum is σ = 2641704. Its totient is φ = 2201400.

The previous prime is 2421547. The next prime is 2421553. The reversal of 2421551 is 1551242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2421551 - 2² = 2421547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421553) 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 3 ways as a sum of consecutive naturals, for example, 110060 + ... + 110081.

It is an arithmetic number, because the mean of its divisors is an integer number (660426).

2^2421551 is an apocalyptic number.

2421551 is a deficient number, since it is larger than the sum of its proper divisors (220153).

2421551 is a wasteful number, since it uses less digits than its factorization.

2421551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220152.

The product of its digits is 400, while the sum is 20.

The square root of 2421551 is about 1556.1333490418. The cubic root of 2421551 is about 134.2861450438.

Adding to 2421551 its reverse (1551242), we get a palindrome (3972793).

The spelling of 2421551 in words is "two million, four hundred twenty-one thousand, five hundred fifty-one".