20001100021988 has 12 divisors (see below), whose sum is σ = 35005008173100. Its totient is φ = 9999669115392.

The previous prime is 20001100021967. The next prime is 20001100021997. The reversal of 20001100021988 is 88912000110002.

It can be written as a sum of positive squares in 2 ways, for example, as 8849387443264 + 11151712578724 = 2974792^2 + 3339418^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220172813 + ... + 220263636.

It is an arithmetic number, because the mean of its divisors is an integer number (2917084014425).

Almost surely, 2^{20001100021988} is an apocalyptic number.

It is an amenable number.

20001100021988 is a deficient number, since it is larger than the sum of its proper divisors (15003908151112).

20001100021988 is a wasteful number, since it uses less digits than its factorization.

20001100021988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440447806 (or 440447804 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 20001100021988 in words is "twenty trillion, one billion, one hundred million, twenty-one thousand, nine hundred eighty-eight".