20021011100001 has 24 divisors (see below), whose sum is σ = 29328236009280. Its totient is φ = 13158594136800.

The previous prime is 20021011099979. The next prime is 20021011100021. The reversal of 20021011100001 is 10000111012002.

It is a happy number.

It is not a de Polignac number, because 20021011100001 - 2⁴² = 15622964588897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20021011100021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10343190 + ... + 12125328.

It is an arithmetic number, because the mean of its divisors is an integer number (1222009833720).

Almost surely, 2^{20021011100001} is an apocalyptic number.

It is an amenable number.

20021011100001 is a deficient number, since it is larger than the sum of its proper divisors (9307224909279).

20021011100001 is a wasteful number, since it uses less digits than its factorization.

20021011100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799797 (or 1799794 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20021011100001 its reverse (10000111012002), we get a palindrome (30021122112003).

The spelling of 20021011100001 in words is "twenty trillion, twenty-one billion, eleven million, one hundred thousand, one".