20011112022221 has 16 divisors (see below), whose sum is σ = 20543027839488. Its totient is φ = 19481295523200.

The previous prime is 20011112022169. The next prime is 20011112022281. The reversal of 20011112022221 is 12222021111002.

It is a cyclic number.

It is not a de Polignac number, because 20011112022221 - 2¹⁴ = 20011112005837 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 20011112022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011112022281) 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, 144105995 + ... + 144244791.

It is an arithmetic number, because the mean of its divisors is an integer number (1283939239968).

Almost surely, 2^{20011112022221} is an apocalyptic number.

It is an amenable number.

20011112022221 is a deficient number, since it is larger than the sum of its proper divisors (531915817267).

20011112022221 is a wasteful number, since it uses less digits than its factorization.

20011112022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146332.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20011112022221 its reverse (12222021111002), we get a palindrome (32233133133223).

The spelling of 20011112022221 in words is "twenty trillion, eleven billion, one hundred twelve million, twenty-two thousand, two hundred twenty-one".