20021112211121 has 16 divisors (see below), whose sum is σ = 23634527354880. Its totient is φ = 16596721322640.

The previous prime is 20021112211109. The next prime is 20021112211147. The reversal of 20021112211121 is 12111221112002.

It is a cyclic number.

It is not a de Polignac number, because 20021112211121 - 2¹⁴ = 20021112194737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021112211121.

It is not an unprimeable number, because it can be changed into a prime (20021112214121) 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, 29252201 + ... + 29928806.

It is an arithmetic number, because the mean of its divisors is an integer number (1477157959680).

Almost surely, 2^{20021112211121} is an apocalyptic number.

It is an amenable number.

20021112211121 is a deficient number, since it is larger than the sum of its proper divisors (3613415143759).

20021112211121 is a wasteful number, since it uses less digits than its factorization.

20021112211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59182604.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20021112211121 its reverse (12111221112002), we get a palindrome (32132333323123).

The spelling of 20021112211121 in words is "twenty trillion, twenty-one billion, one hundred twelve million, two hundred eleven thousand, one hundred twenty-one".