2421657121 has 4 divisors (see below), whose sum is σ = 2607938452. Its totient is φ = 2235375792.

The previous prime is 2421657109. The next prime is 2421657181. The reversal of 2421657121 is 1217561242.

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

It can be written as a sum of positive squares in 2 ways, for example, as 435974400 + 1985682721 = 20880^2 + 44561^2 .

It is not a de Polignac number, because 2421657121 - 2¹⁵ = 2421624353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421657181) 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, 93140646 + ... + 93140671.

It is an arithmetic number, because the mean of its divisors is an integer number (651984613).

Almost surely, 2^2421657121 is an apocalyptic number.

It is an amenable number.

2421657121 is a deficient number, since it is larger than the sum of its proper divisors (186281331).

2421657121 is a wasteful number, since it uses less digits than its factorization.

2421657121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186281330.

The product of its digits is 6720, while the sum is 31.

The square root of 2421657121 is about 49210.3355099312. The cubic root of 2421657121 is about 1342.8810664770.

The spelling of 2421657121 in words is "two billion, four hundred twenty-one million, six hundred fifty-seven thousand, one hundred twenty-one".