240716921 has 2 divisors, whose sum is σ = 240716922. Its totient is φ = 240716920.

The previous prime is 240716887. The next prime is 240716951. The reversal of 240716921 is 129617042.

It is a happy number.

240716921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215355625 + 25361296 = 14675^2 + 5036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240716921 is a prime.

It is not a weakly prime, because it can be changed into another prime (240716951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120358460 + 120358461.

It is an arithmetic number, because the mean of its divisors is an integer number (120358461).

Almost surely, 2^240716921 is an apocalyptic number.

It is an amenable number.

240716921 is a deficient number, since it is larger than the sum of its proper divisors (1).

240716921 is an equidigital number, since it uses as much as digits as its factorization.

240716921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 240716921 is about 15515.0546566875. The cubic root of 240716921 is about 622.0646750228.

The spelling of 240716921 in words is "two hundred forty million, seven hundred sixteen thousand, nine hundred twenty-one".