20001021101 has 8 divisors (see below), whose sum is σ = 21493635840. Its totient is φ = 18543526848.

The previous prime is 20001021097. The next prime is 20001021119. The reversal of 20001021101 is 10112010002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001021101 - 2² = 20001021097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001021401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8778941 + ... + 8781218.

It is an arithmetic number, because the mean of its divisors is an integer number (2686704480).

Almost surely, 2^20001021101 is an apocalyptic number.

It is an amenable number.

20001021101 is a deficient number, since it is larger than the sum of its proper divisors (1492614739).

20001021101 is a wasteful number, since it uses less digits than its factorization.

20001021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17560243.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20001021101 its reverse (10112010002), we get a palindrome (30113031103).

The spelling of 20001021101 in words is "twenty billion, one million, twenty-one thousand, one hundred one".