2421730661 has 4 divisors (see below), whose sum is σ = 2767692192. Its totient is φ = 2075769132.

The previous prime is 2421730657. The next prime is 2421730687. The reversal of 2421730661 is 1660371242.

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.

It is a cyclic number.

It is not a de Polignac number, because 2421730661 - 2² = 2421730657 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 (2421735661) 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, 172980755 + ... + 172980768.

It is an arithmetic number, because the mean of its divisors is an integer number (691923048).

Almost surely, 2^2421730661 is an apocalyptic number.

It is an amenable number.

2421730661 is a deficient number, since it is larger than the sum of its proper divisors (345961531).

2421730661 is an equidigital number, since it uses as much as digits as its factorization.

2421730661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345961530.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 2421730661 is about 49211.0827050168. The cubic root of 2421730661 is about 1342.8946597136.

The spelling of 2421730661 in words is "two billion, four hundred twenty-one million, seven hundred thirty thousand, six hundred sixty-one".