20021100211021 has 16 divisors (see below), whose sum is σ = 25436236499968. Its totient is φ = 15329874672000.

The previous prime is 20021100210901. The next prime is 20021100211031. The reversal of 20021100211021 is 12011200112002.

It is not a de Polignac number, because 20021100211021 - 2¹⁹ = 20021099686733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20021100210992 and 20021100211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100211031) 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, 3548579280 + ... + 3548584921.

It is an arithmetic number, because the mean of its divisors is an integer number (1589764781248).

Almost surely, 2^{20021100211021} is an apocalyptic number.

It is an amenable number.

20021100211021 is a deficient number, since it is larger than the sum of its proper divisors (5415136288947).

20021100211021 is a wasteful number, since it uses less digits than its factorization.

20021100211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7097164252.

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

Adding to 20021100211021 its reverse (12011200112002), we get a palindrome (32032300323023).

The spelling of 20021100211021 in words is "twenty trillion, twenty-one billion, one hundred million, two hundred eleven thousand, twenty-one".