20121022111 has 2 divisors, whose sum is σ = 20121022112. Its totient is φ = 20121022110.

The previous prime is 20121022079. The next prime is 20121022123. The reversal of 20121022111 is 11122012102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121022111 - 2⁵ = 20121022079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121022091 and 20121022100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121022171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060511055 + 10060511056.

It is an arithmetic number, because the mean of its divisors is an integer number (10060511056).

Almost surely, 2^20121022111 is an apocalyptic number.

20121022111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121022111 is an equidigital number, since it uses as much as digits as its factorization.

20121022111 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 20121022111 its reverse (11122012102), we get a palindrome (31243034213).

The spelling of 20121022111 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred eleven".