21200326487 has 2 divisors, whose sum is σ = 21200326488. Its totient is φ = 21200326486.

The previous prime is 21200326481. The next prime is 21200326513. The reversal of 21200326487 is 78462300212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200326487 - 2⁴ = 21200326471 is a prime.

It is a super-2 number, since 2×21200326487² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200326481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600163243 + 10600163244.

It is an arithmetic number, because the mean of its divisors is an integer number (10600163244).

Almost surely, 2^21200326487 is an apocalyptic number.

21200326487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200326487 is an equidigital number, since it uses as much as digits as its factorization.

21200326487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 35.

Adding to 21200326487 its reverse (78462300212), we get a palindrome (99662626699).

The spelling of 21200326487 in words is "twenty-one billion, two hundred million, three hundred twenty-six thousand, four hundred eighty-seven".