20001122211021 has 64 divisors (see below), whose sum is σ = 31197588988416. Its totient is φ = 11162271744000.

The previous prime is 20001122210911. The next prime is 20001122211041. The reversal of 20001122211021 is 12011222110002.

It is not a de Polignac number, because 20001122211021 - 2¹⁵ = 20001122178253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001122211041) 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 63 ways as a sum of consecutive naturals, for example, 102947871 + ... + 103141971.

It is an arithmetic number, because the mean of its divisors is an integer number (487462327944).

Almost surely, 2^{20001122211021} is an apocalyptic number.

20001122211021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20001122211021 is a deficient number, since it is larger than the sum of its proper divisors (11196466777395).

20001122211021 is a wasteful number, since it uses less digits than its factorization.

20001122211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194742.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20001122211021 its reverse (12011222110002), we get a palindrome (32012344321023).

The spelling of 20001122211021 in words is "twenty trillion, one billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".