20021111201011 has 4 divisors (see below), whose sum is σ = 20021127171472. Its totient is φ = 20021095230552.

The previous prime is 20021111200861. The next prime is 20021111201087. The reversal of 20021111201011 is 11010211112002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021111201011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021111200982 and 20021111201000.

It is not an unprimeable number, because it can be changed into a prime (20021111208011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5928135 + ... + 8670928.

It is an arithmetic number, because the mean of its divisors is an integer number (5005281792868).

Almost surely, 2^{20021111201011} is an apocalyptic number.

20021111201011 is a deficient number, since it is larger than the sum of its proper divisors (15970461).

20021111201011 is a wasteful number, since it uses less digits than its factorization.

20021111201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15970460.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20021111201011 its reverse (11010211112002), we get a palindrome (31031322313013).

The spelling of 20021111201011 in words is "twenty trillion, twenty-one billion, one hundred eleven million, two hundred one thousand, eleven".