20121201010111 has 2 divisors, whose sum is σ = 20121201010112. Its totient is φ = 20121201010110.

The previous prime is 20121201010093. The next prime is 20121201010171. The reversal of 20121201010111 is 11101010212102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121201010111 - 2¹⁹ = 20121200485823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121201010091 and 20121201010100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121201010171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060600505055 + 10060600505056.

It is an arithmetic number, because the mean of its divisors is an integer number (10060600505056).

Almost surely, 2^{20121201010111} is an apocalyptic number.

20121201010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121201010111 is an equidigital number, since it uses as much as digits as its factorization.

20121201010111 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 13.

Adding to 20121201010111 its reverse (11101010212102), we get a palindrome (31222211222213).

The spelling of 20121201010111 in words is "twenty trillion, one hundred twenty-one billion, two hundred one million, ten thousand, one hundred eleven".