12122011115547 has 4 divisors (see below), whose sum is σ = 16162681487400. Its totient is φ = 8081340743696.

The previous prime is 12122011115509. The next prime is 12122011115549. The reversal of 12122011115547 is 74551111022121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12122011115547 - 2⁷ = 12122011115419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12122011115549) 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, 2020335185922 + ... + 2020335185927.

It is an arithmetic number, because the mean of its divisors is an integer number (4040670371850).

Almost surely, 2^{12122011115547} is an apocalyptic number.

12122011115547 is a deficient number, since it is larger than the sum of its proper divisors (4040670371853).

12122011115547 is an equidigital number, since it uses as much as digits as its factorization.

12122011115547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040670371852.

The product of its (nonzero) digits is 5600, while the sum is 33.

Adding to 12122011115547 its reverse (74551111022121), we get a palindrome (86673122137668).

The spelling of 12122011115547 in words is "twelve trillion, one hundred twenty-two billion, eleven million, one hundred fifteen thousand, five hundred forty-seven".