121123212111 has 16 divisors (see below), whose sum is σ = 195754686720. Its totient is φ = 73408007160.

The previous prime is 121123212103. The next prime is 121123212137. The reversal of 121123212111 is 111212321121.

It is a happy number.

121123212111 is a `hidden beast` number, since 121 + 12 + 321 + 211 + 1 = 666.

It is not a de Polignac number, because 121123212111 - 2³ = 121123212103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123212101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203910835 + ... + 203911428.

It is an arithmetic number, because the mean of its divisors is an integer number (12234667920).

Almost surely, 2^121123212111 is an apocalyptic number.

121123212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121123212111 is a deficient number, since it is larger than the sum of its proper divisors (74631474609).

121123212111 is a wasteful number, since it uses less digits than its factorization.

121123212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407822283 (or 407822277 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 121123212111 its reverse (111212321121), we get a palindrome (232335533232).

It can be divided in two parts, 12112 and 3212111, that added together give a palindrome (3224223).

The spelling of 121123212111 in words is "one hundred twenty-one billion, one hundred twenty-three million, two hundred twelve thousand, one hundred eleven".