20100111122221 has 16 divisors (see below), whose sum is σ = 22085820408960. Its totient is φ = 18180400674240.

The previous prime is 20100111122213. The next prime is 20100111122249. The reversal of 20100111122221 is 12222111100102.

It is a cyclic number.

It is not a de Polignac number, because 20100111122221 - 2³ = 20100111122213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100111122195 and 20100111122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100111122281) 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, 66649966 + ... + 66950863.

It is an arithmetic number, because the mean of its divisors is an integer number (1380363775560).

Almost surely, 2^{20100111122221} is an apocalyptic number.

It is an amenable number.

20100111122221 is a deficient number, since it is larger than the sum of its proper divisors (1985709286739).

20100111122221 is a wasteful number, since it uses less digits than its factorization.

20100111122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133601076.

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

Adding to 20100111122221 its reverse (12222111100102), we get a palindrome (32322222222323).

The spelling of 20100111122221 in words is "twenty trillion, one hundred billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".