21266451842500 has 60 divisors (see below), whose sum is σ = 47586999848080. Its totient is φ = 8308753236000.

The previous prime is 21266451842491. The next prime is 21266451842513. The reversal of 21266451842500 is 524815466212.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 98806230 + ... + 99021229.

Almost surely, 2^{21266451842500} is an apocalyptic number.

21266451842500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21266451842500 is an abundant number, since it is smaller than the sum of its proper divisors (26320548005580).

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

21266451842500 is a wasteful number, since it uses less digits than its factorization.

21266451842500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197827526 (or 197827509 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 21266451842500 in words is "twenty-one trillion, two hundred sixty-six billion, four hundred fifty-one million, eight hundred forty-two thousand, five hundred".