2421791561 has 16 divisors (see below), whose sum is σ = 2825533440. Its totient is φ = 2032793280.

The previous prime is 2421791551. The next prime is 2421791569. The reversal of 2421791561 is 1651971242.

It is not a de Polignac number, because 2421791561 - 2⁶ = 2421791497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421791569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85400 + ... + 110166.

It is an arithmetic number, because the mean of its divisors is an integer number (176595840).

Almost surely, 2^2421791561 is an apocalyptic number.

It is an amenable number.

2421791561 is a deficient number, since it is larger than the sum of its proper divisors (403741879).

2421791561 is a wasteful number, since it uses less digits than its factorization.

2421791561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25064.

The product of its digits is 30240, while the sum is 38.

The square root of 2421791561 is about 49211.7014641843. The cubic root of 2421791561 is about 1342.9059163465.

The spelling of 2421791561 in words is "two billion, four hundred twenty-one million, seven hundred ninety-one thousand, five hundred sixty-one".