20021201111 has 2 divisors, whose sum is σ = 20021201112. Its totient is φ = 20021201110.

The previous prime is 20021201093. The next prime is 20021201119. The reversal of 20021201111 is 11110212002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021201111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021201092 and 20021201101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021201119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010600555 + 10010600556.

It is an arithmetic number, because the mean of its divisors is an integer number (10010600556).

Almost surely, 2^20021201111 is an apocalyptic number.

20021201111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021201111 is an equidigital number, since it uses as much as digits as its factorization.

20021201111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20021201111 its reverse (11110212002), we get a palindrome (31131413113).

The spelling of 20021201111 in words is "twenty billion, twenty-one million, two hundred one thousand, one hundred eleven".