101220121111 has 2 divisors, whose sum is σ = 101220121112. Its totient is φ = 101220121110.

The previous prime is 101220121109. The next prime is 101220121129. The reversal of 101220121111 is 111121022101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101220121111 - 2¹ = 101220121109 is a prime.

Together with 101220121109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 101220121091 and 101220121100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101220101111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610060555 + 50610060556.

It is an arithmetic number, because the mean of its divisors is an integer number (50610060556).

Almost surely, 2^101220121111 is an apocalyptic number.

101220121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

101220121111 is an equidigital number, since it uses as much as digits as its factorization.

101220121111 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 101220121111 its reverse (111121022101), we get a palindrome (212341143212).

The spelling of 101220121111 in words is "one hundred one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred eleven".