121012311123111 has 4 divisors (see below), whose sum is σ = 161349748164152. Its totient is φ = 80674874082072.

The previous prime is 121012311123089. The next prime is 121012311123113. The reversal of 121012311123111 is 111321113210121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121012311123111 - 2¹⁸ = 121012310860967 is a prime.

It is a super-2 number, since 2×121012311123111² (a number of 29 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 (121012311123113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20168718520516 + ... + 20168718520521.

It is an arithmetic number, because the mean of its divisors is an integer number (40337437041038).

Almost surely, 2^{121012311123111} is an apocalyptic number.

121012311123111 is a deficient number, since it is larger than the sum of its proper divisors (40337437041041).

121012311123111 is an equidigital number, since it uses as much as digits as its factorization.

121012311123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40337437041040.

The product of its (nonzero) digits is 72, while the sum is 21.

Adding to 121012311123111 its reverse (111321113210121), we get a palindrome (232333424333232).

The spelling of 121012311123111 in words is "one hundred twenty-one trillion, twelve billion, three hundred eleven million, one hundred twenty-three thousand, one hundred eleven".