21450830852 has 12 divisors (see below), whose sum is σ = 40951586256. Its totient is φ = 9750377640.

The previous prime is 21450830831. The next prime is 21450830893. The reversal of 21450830852 is 25803805412.

It is a super-2 number, since 2×21450830852² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243759398 + ... + 243759485.

It is an arithmetic number, because the mean of its divisors is an integer number (3412632188).

Almost surely, 2^21450830852 is an apocalyptic number.

21450830852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21450830852 is a deficient number, since it is larger than the sum of its proper divisors (19500755404).

21450830852 is a wasteful number, since it uses less digits than its factorization.

21450830852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487518898 (or 487518896 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 21450830852 in words is "twenty-one billion, four hundred fifty million, eight hundred thirty thousand, eight hundred fifty-two".