21300021499 has 2 divisors, whose sum is σ = 21300021500. Its totient is φ = 21300021498.

The previous prime is 21300021461. The next prime is 21300021521. The reversal of 21300021499 is 99412000312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300021499 - 2¹¹ = 21300019451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21300021499.

It is not a weakly prime, because it can be changed into another prime (21300061499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650010749 + 10650010750.

It is an arithmetic number, because the mean of its divisors is an integer number (10650010750).

Almost surely, 2^21300021499 is an apocalyptic number.

21300021499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300021499 is an equidigital number, since it uses as much as digits as its factorization.

21300021499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 21300021499 in words is "twenty-one billion, three hundred million, twenty-one thousand, four hundred ninety-nine".