20012221111 has 2 divisors, whose sum is σ = 20012221112. Its totient is φ = 20012221110.

The previous prime is 20012221093. The next prime is 20012221121. The reversal of 20012221111 is 11112221002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20012221111 - 2⁵ = 20012221079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012221091 and 20012221100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012221121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006110555 + 10006110556.

It is an arithmetic number, because the mean of its divisors is an integer number (10006110556).

Almost surely, 2^20012221111 is an apocalyptic number.

20012221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012221111 is an equidigital number, since it uses as much as digits as its factorization.

20012221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20012221111 its reverse (11112221002), we get a palindrome (31124442113).

The spelling of 20012221111 in words is "twenty billion, twelve million, two hundred twenty-one thousand, one hundred eleven".