21230312208 has 80 divisors (see below), whose sum is σ = 63288615936. Its totient is φ = 6006902400.

The previous prime is 21230312107. The next prime is 21230312209. The reversal of 21230312208 is 80221303212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21230312209) 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 15 ways as a sum of consecutive naturals, for example, 272118 + ... + 341333.

Almost surely, 2^21230312208 is an apocalyptic number.

21230312208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21230312208 is an abundant number, since it is smaller than the sum of its proper divisors (42058303728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230312208 is a wasteful number, since it uses less digits than its factorization.

21230312208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613572 (or 613566 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The spelling of 21230312208 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, two hundred eight".