121000021091111 has 2 divisors, whose sum is σ = 121000021091112. Its totient is φ = 121000021091110.

The previous prime is 121000021091099. The next prime is 121000021091119. The reversal of 121000021091111 is 111190120000121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121000021091111 - 2²⁶ = 120999953982247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121000021091119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500010545555 + 60500010545556.

It is an arithmetic number, because the mean of its divisors is an integer number (60500010545556).

Almost surely, 2^{121000021091111} is an apocalyptic number.

121000021091111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000021091111 is an equidigital number, since it uses as much as digits as its factorization.

121000021091111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 20.

Adding to 121000021091111 its reverse (111190120000121), we get a palindrome (232190141091232).

The spelling of 121000021091111 in words is "one hundred twenty-one trillion, twenty-one million, ninety-one thousand, one hundred eleven".