21030213499 has 2 divisors, whose sum is σ = 21030213500. Its totient is φ = 21030213498.

The previous prime is 21030213481. The next prime is 21030213521. The reversal of 21030213499 is 99431203012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030213499 - 2⁵ = 21030213467 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030213469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515106749 + 10515106750.

It is an arithmetic number, because the mean of its divisors is an integer number (10515106750).

Almost surely, 2^21030213499 is an apocalyptic number.

21030213499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030213499 is an equidigital number, since it uses as much as digits as its factorization.

21030213499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 21030213499 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, four hundred ninety-nine".