21030765299 has 4 divisors (see below), whose sum is σ = 21238990800. Its totient is φ = 20822539800.

The previous prime is 21030765289. The next prime is 21030765307. The reversal of 21030765299 is 99256703012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21030765299 - 2⁸ = 21030765043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030765269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104112599 + ... + 104112800.

It is an arithmetic number, because the mean of its divisors is an integer number (5309747700).

Almost surely, 2^21030765299 is an apocalyptic number.

21030765299 is a deficient number, since it is larger than the sum of its proper divisors (208225501).

21030765299 is a wasteful number, since it uses less digits than its factorization.

21030765299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208225500.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 21030765299 in words is "twenty-one billion, thirty million, seven hundred sixty-five thousand, two hundred ninety-nine".