21017070000000 has 1536 divisors, whose sum is σ = 81107722051200. Its totient is φ = 5423760000000.

The previous prime is 21017069999963. The next prime is 21017070000019. The reversal of 21017070000000 is 7071012.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 677969999985 + ... + 677970000015.

Almost surely, 2^{21017070000000} is an apocalyptic number.

21017070000000 is a gapful number since it is divisible by the number (20) 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 21017070000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40553861025600).

21017070000000 is an abundant number, since it is smaller than the sum of its proper divisors (60090652051200).

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

21017070000000 is an frugal number, since it uses more digits than its factorization.

21017070000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

Adding to 21017070000000 its reverse (7071012), we get a palindrome (21017077071012).

The spelling of 21017070000000 in words is "twenty-one trillion, seventeen billion, seventy million", and thus it is an aban number and an uban number.