21301001507 has 2 divisors, whose sum is σ = 21301001508. Its totient is φ = 21301001506.

The previous prime is 21301001503. The next prime is 21301001521. The reversal of 21301001507 is 70510010312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21301001507 - 2² = 21301001503 is a prime.

It is not a weakly prime, because it can be changed into another prime (21301001503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650500753 + 10650500754.

It is an arithmetic number, because the mean of its divisors is an integer number (10650500754).

Almost surely, 2^21301001507 is an apocalyptic number.

21301001507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301001507 is an equidigital number, since it uses as much as digits as its factorization.

21301001507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 20.

Adding to 21301001507 its reverse (70510010312), we get a palindrome (91811011819).

The spelling of 21301001507 in words is "twenty-one billion, three hundred one million, one thousand, five hundred seven".