2421736391 has 2 divisors, whose sum is σ = 2421736392. Its totient is φ = 2421736390.

The previous prime is 2421736363. The next prime is 2421736433. The reversal of 2421736391 is 1936371242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2421736391 - 2⁶ = 2421736327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421736591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210868195 + 1210868196.

It is an arithmetic number, because the mean of its divisors is an integer number (1210868196).

Almost surely, 2^2421736391 is an apocalyptic number.

2421736391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421736391 is an equidigital number, since it uses as much as digits as its factorization.

2421736391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 2421736391 is about 49211.1409235754. The cubic root of 2421736391 is about 1342.8957188432.

The spelling of 2421736391 in words is "two billion, four hundred twenty-one million, seven hundred thirty-six thousand, three hundred ninety-one".