21166702011520 has 128 divisors (see below), whose sum is σ = 54738454256640. Its totient is φ = 7780350357504.

The previous prime is 21166702011473. The next prime is 21166702011557. The reversal of 21166702011520 is 2511020766112.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3848844 + ... + 7559563.

It is an arithmetic number, because the mean of its divisors is an integer number (427644173880).

Almost surely, 2^{21166702011520} is an apocalyptic number.

21166702011520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21166702011520 is an abundant number, since it is smaller than the sum of its proper divisors (33571752245120).

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

21166702011520 is a wasteful number, since it uses less digits than its factorization.

21166702011520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408662 (or 11408650 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

Adding to 21166702011520 its reverse (2511020766112), we get a palindrome (23677722777632).

The spelling of 21166702011520 in words is "twenty-one trillion, one hundred sixty-six billion, seven hundred two million, eleven thousand, five hundred twenty".