21161266360700 has 72 divisors (see below), whose sum is σ = 46396420803600. Its totient is φ = 8376904166400.

The previous prime is 21161266360699. The next prime is 21161266360711. The reversal of 21161266360700 is 706366216112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6052751 + ... + 8885849.

Almost surely, 2^{21161266360700} is an apocalyptic number.

21161266360700 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 21161266360700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23198210401800).

21161266360700 is an abundant number, since it is smaller than the sum of its proper divisors (25235154442900).

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

21161266360700 is a wasteful number, since it uses less digits than its factorization.

21161266360700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833887 (or 2833880 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 21161266360700 in words is "twenty-one trillion, one hundred sixty-one billion, two hundred sixty-six million, three hundred sixty thousand, seven hundred".