20012111010221 has 16 divisors (see below), whose sum is σ = 21928954871040. Its totient is φ = 18111543468480.

The previous prime is 20012111010193. The next prime is 20012111010233. The reversal of 20012111010221 is 12201011121002.

It is a de Polignac number, because none of the positive numbers 2^k-20012111010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012111010196 and 20012111010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012111030221) 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 15 ways as a sum of consecutive naturals, for example, 24708335 + ... + 25505411.

It is an arithmetic number, because the mean of its divisors is an integer number (1370559679440).

Almost surely, 2^{20012111010221} is an apocalyptic number.

It is an amenable number.

20012111010221 is a deficient number, since it is larger than the sum of its proper divisors (1916843860819).

20012111010221 is a wasteful number, since it uses less digits than its factorization.

20012111010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807284.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20012111010221 its reverse (12201011121002), we get a palindrome (32213122131223).

The spelling of 20012111010221 in words is "twenty trillion, twelve billion, one hundred eleven million, ten thousand, two hundred twenty-one".