21070967808 has 176 divisors, whose sum is σ = 62575709184. Its totient is φ = 6248816640.

The previous prime is 21070967791. The next prime is 21070967821. The reversal of 21070967808 is 80876907012.

It is a tau number, because it is divible by the number of its divisors (176).

It is a Harshad number since it is a multiple of its sum of digits (48).

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 15 ways as a sum of consecutive naturals, for example, 1581591 + ... + 1594857.

Almost surely, 2^21070967808 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 21070967808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31287854592).

21070967808 is an abundant number, since it is smaller than the sum of its proper divisors (41504741376).

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

21070967808 is a wasteful number, since it uses less digits than its factorization.

21070967808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13348 (or 13330 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 21070967808 in words is "twenty-one billion, seventy million, nine hundred sixty-seven thousand, eight hundred eight".