21147834708 has 576 divisors, whose sum is σ = 76846049280. Its totient is φ = 4721587200.

The previous prime is 21147834707. The next prime is 21147834713. The reversal of 21147834708 is 80743874112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147834703) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 45873598 + ... + 45874058.

It is an arithmetic number, because the mean of its divisors is an integer number (133413280).

Almost surely, 2^21147834708 is an apocalyptic number.

21147834708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21147834708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38423024640).

21147834708 is an abundant number, since it is smaller than the sum of its proper divisors (55698214572).

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

21147834708 is a wasteful number, since it uses less digits than its factorization.

21147834708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 21147834708 in words is "twenty-one billion, one hundred forty-seven million, eight hundred thirty-four thousand, seven hundred eight".