2421244921 has 4 divisors (see below), whose sum is σ = 2421353844. Its totient is φ = 2421136000.

The previous prime is 2421244913. The next prime is 2421244927. The reversal of 2421244921 is 1294421242.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1301405625 + 1119839296 = 36075^2 + 33464^2 .

It is a 3-Lehmer number, since φ(2421244921) divides (2421244921-1)³.

It is a cyclic number.

It is not a de Polignac number, because 2421244921 - 2³ = 2421244913 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a deceptive number, since it divides R_2421244920.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421244927) 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, 7780 + ... + 70021.

It is an arithmetic number, because the mean of its divisors is an integer number (605338461).

It is a Poulet number, since it divides 2^2421244920-1.

Almost surely, 2^2421244921 is an apocalyptic number.

2421244921 is the 31121-st heptagonal number.

It is an amenable number.

2421244921 is a deficient number, since it is larger than the sum of its proper divisors (108923).

2421244921 is an equidigital number, since it uses as much as digits as its factorization.

2421244921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108922.

The product of its digits is 9216, while the sum is 31.

The square root of 2421244921 is about 49206.1471871147. The cubic root of 2421244921 is about 1342.8048697575.

The spelling of 2421244921 in words is "two billion, four hundred twenty-one million, two hundred forty-four thousand, nine hundred twenty-one".