21241651507 has 2 divisors, whose sum is σ = 21241651508. Its totient is φ = 21241651506.

The previous prime is 21241651499. The next prime is 21241651513. The reversal of 21241651507 is 70515614212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21241651507 - 2³ = 21241651499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21241651307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620825753 + 10620825754.

It is an arithmetic number, because the mean of its divisors is an integer number (10620825754).

Almost surely, 2^21241651507 is an apocalyptic number.

21241651507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241651507 is an equidigital number, since it uses as much as digits as its factorization.

21241651507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 21241651507 in words is "twenty-one billion, two hundred forty-one million, six hundred fifty-one thousand, five hundred seven".