21002301587 has 2 divisors, whose sum is σ = 21002301588. Its totient is φ = 21002301586.

The previous prime is 21002301583. The next prime is 21002301589. The reversal of 21002301587 is 78510320012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002301587 - 2² = 21002301583 is a prime.

Together with 21002301589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21002301583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501150793 + 10501150794.

It is an arithmetic number, because the mean of its divisors is an integer number (10501150794).

Almost surely, 2^21002301587 is an apocalyptic number.

21002301587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002301587 is an equidigital number, since it uses as much as digits as its factorization.

21002301587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 21002301587 its reverse (78510320012), we get a palindrome (99512621599).

The spelling of 21002301587 in words is "twenty-one billion, two million, three hundred one thousand, five hundred eighty-seven".