21450830853 has 4 divisors (see below), whose sum is σ = 28601107808. Its totient is φ = 14300553900.

The previous prime is 21450830831. The next prime is 21450830893. The reversal of 21450830853 is 35803805412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21450830853 - 2⁶ = 21450830789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450830803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575138473 + ... + 3575138478.

It is an arithmetic number, because the mean of its divisors is an integer number (7150276952).

Almost surely, 2^21450830853 is an apocalyptic number.

It is an amenable number.

21450830853 is a deficient number, since it is larger than the sum of its proper divisors (7150276955).

21450830853 is an equidigital number, since it uses as much as digits as its factorization.

21450830853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150276954.

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 21450830853 in words is "twenty-one billion, four hundred fifty million, eight hundred thirty thousand, eight hundred fifty-three".