12120511 has 6 divisors (see below), whose sum is σ = 13124760. Its totient is φ = 11188008.

The previous prime is 12120509. The next prime is 12120523. The reversal of 12120511 is 11502121.

It is not a de Polignac number, because 12120511 - 2¹ = 12120509 is a prime.

It is a super-2 number, since 2×12120511² = 293813573802242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120491 and 12120500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35691 + ... + 36028.

It is an arithmetic number, because the mean of its divisors is an integer number (2187460).

Almost surely, 2^12120511 is an apocalyptic number.

12120511 is a deficient number, since it is larger than the sum of its proper divisors (1004249).

12120511 is an equidigital number, since it uses as much as digits as its factorization.

12120511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71745 (or 71732 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 12120511 is about 3481.4524267897. The cubic root of 12120511 is about 229.7066897537.

Adding to 12120511 its reverse (11502121), we get a palindrome (23622632).

The spelling of 12120511 in words is "twelve million, one hundred twenty thousand, five hundred eleven".