120121251111 has 6 divisors (see below), whose sum is σ = 173508473840. Its totient is φ = 80080834068.

The previous prime is 120121251091. The next prime is 120121251181. The reversal of 120121251111 is 111152121021.

It is a happy number.

120121251111 is a `hidden beast` number, since 1 + 20 + 121 + 2 + 511 + 11 = 666.

It is not a de Polignac number, because 120121251111 - 2¹¹ = 120121249063 is a prime.

It is a super-2 number, since 2×120121251111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121251181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6673402831 + ... + 6673402848.

Almost surely, 2^120121251111 is an apocalyptic number.

120121251111 is a deficient number, since it is larger than the sum of its proper divisors (53387222729).

120121251111 is a wasteful number, since it uses less digits than its factorization.

120121251111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346805685 (or 13346805682 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 18.

Adding to 120121251111 its reverse (111152121021), we get a palindrome (231273372132).

The spelling of 120121251111 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred fifty-one thousand, one hundred eleven".