121121331111 has 48 divisors (see below), whose sum is σ = 204931254528. Its totient is φ = 68115667200.

The previous prime is 121121331091. The next prime is 121121331143. The reversal of 121121331111 is 111133121121.

It is not a de Polignac number, because 121121331111 - 2⁷ = 121121330983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121331181) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 387321 + ... + 626306.

It is an arithmetic number, because the mean of its divisors is an integer number (4269401136).

Almost surely, 2^121121331111 is an apocalyptic number.

121121331111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121121331111 is a deficient number, since it is larger than the sum of its proper divisors (83809923417).

121121331111 is a wasteful number, since it uses less digits than its factorization.

121121331111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013732 (or 1013729 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 121121331111 its reverse (111133121121), we get a palindrome (232254452232).

The spelling of 121121331111 in words is "one hundred twenty-one billion, one hundred twenty-one million, three hundred thirty-one thousand, one hundred eleven".