20001021221011 has 16 divisors (see below), whose sum is σ = 20461866606720. Its totient is φ = 19543415748480.

The previous prime is 20001021220991. The next prime is 20001021221023. The reversal of 20001021221011 is 11012212010002.

It is a cyclic number.

It is not a de Polignac number, because 20001021221011 - 2¹⁷ = 20001021089939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001021220982 and 20001021221000.

It is not an unprimeable number, because it can be changed into a prime (20001021221081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13302726 + ... + 14729716.

It is an arithmetic number, because the mean of its divisors is an integer number (1278866662920).

Almost surely, 2^{20001021221011} is an apocalyptic number.

20001021221011 is a deficient number, since it is larger than the sum of its proper divisors (460845385709).

20001021221011 is a wasteful number, since it uses less digits than its factorization.

20001021221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428126.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001021221011 its reverse (11012212010002), we get a palindrome (31013233231013).

The spelling of 20001021221011 in words is "twenty trillion, one billion, twenty-one million, two hundred twenty-one thousand, eleven".