20011110212221 has 12 divisors (see below), whose sum is σ = 21125482345344. Its totient is φ = 18952756374600.

The previous prime is 20011110212209. The next prime is 20011110212281. The reversal of 20011110212221 is 12221201111002.

It is not a de Polignac number, because 20011110212221 - 2⁹ = 20011110211709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011110212195 and 20011110212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011110212281) 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 11 ways as a sum of consecutive naturals, for example, 6176685 + ... + 8841586.

It is an arithmetic number, because the mean of its divisors is an integer number (1760456862112).

Almost surely, 2^{20011110212221} is an apocalyptic number.

It is an amenable number.

20011110212221 is a deficient number, since it is larger than the sum of its proper divisors (1114372133123).

20011110212221 is a wasteful number, since it uses less digits than its factorization.

20011110212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15022000 (or 15021981 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20011110212221 its reverse (12221201111002), we get a palindrome (32232311323223).

The spelling of 20011110212221 in words is "twenty trillion, eleven billion, one hundred ten million, two hundred twelve thousand, two hundred twenty-one".