2421557 has 4 divisors (see below), whose sum is σ = 2432640. Its totient is φ = 2410476.

The previous prime is 2421553. The next prime is 2421577. The reversal of 2421557 is 7551242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7551242 = 2 ⋅3775621.

It is a cyclic number.

It is not a de Polignac number, because 2421557 - 2² = 2421553 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5207 + ... + 5652.

It is an arithmetic number, because the mean of its divisors is an integer number (608160).

2^2421557 is an apocalyptic number.

It is an amenable number.

2421557 is a deficient number, since it is larger than the sum of its proper divisors (11083).

2421557 is a wasteful number, since it uses less digits than its factorization.

2421557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11082.

The product of its digits is 2800, while the sum is 26.

The square root of 2421557 is about 1556.1352768959. The cubic root of 2421557 is about 134.2862559529.

Adding to 2421557 its reverse (7551242), we get a palindrome (9972799).

The spelling of 2421557 in words is "two million, four hundred twenty-one thousand, five hundred fifty-seven".