21208300992 has 168 divisors, whose sum is σ = 64497305600. Its totient is φ = 6644187648.

The previous prime is 21208300987. The next prime is 21208301131. The reversal of 21208300992 is 29900380212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1382259 + ... + 1397517.

Almost surely, 2^21208300992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21208300992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32248652800).

21208300992 is an abundant number, since it is smaller than the sum of its proper divisors (43289004608).

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

21208300992 is a wasteful number, since it uses less digits than its factorization.

21208300992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15423 (or 15410 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 21208300992 in words is "twenty-one billion, two hundred eight million, three hundred thousand, nine hundred ninety-two".