21243004208 has 20 divisors (see below), whose sum is σ = 41162255328. Its totient is φ = 10620486720.

The previous prime is 21243004193. The next prime is 21243004219. The reversal of 21243004208 is 80240034212.

It is a super-2 number, since 2×21243004208² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

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, 126338 + ... + 241758.

Almost surely, 2^21243004208 is an apocalyptic number.

It is an amenable number.

21243004208 is a deficient number, since it is larger than the sum of its proper divisors (19919251120).

21243004208 is a wasteful number, since it uses less digits than its factorization.

21243004208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126932 (or 126926 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The spelling of 21243004208 in words is "twenty-one billion, two hundred forty-three million, four thousand, two hundred eight".