20201021111 has 2 divisors, whose sum is σ = 20201021112. Its totient is φ = 20201021110.

The previous prime is 20201021077. The next prime is 20201021123. The reversal of 20201021111 is 11112010202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20201021111 - 2³⁴ = 3021151927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20201021092 and 20201021101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201021311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100510555 + 10100510556.

It is an arithmetic number, because the mean of its divisors is an integer number (10100510556).

Almost surely, 2^20201021111 is an apocalyptic number.

20201021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201021111 is an equidigital number, since it uses as much as digits as its factorization.

20201021111 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 20201021111 its reverse (11112010202), we get a palindrome (31313031313).

The spelling of 20201021111 in words is "twenty billion, two hundred one million, twenty-one thousand, one hundred eleven".