12121474645 has 16 divisors (see below), whose sum is σ = 16857877248. Its totient is φ = 8194798080.

The previous prime is 12121474621. The next prime is 12121474663. The reversal of 12121474645 is 54647412121.

It is not a de Polignac number, because 12121474645 - 2¹³ = 12121466453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2436444 + ... + 2441413.

It is an arithmetic number, because the mean of its divisors is an integer number (1053617328).

Almost surely, 2^12121474645 is an apocalyptic number.

It is an amenable number.

12121474645 is a deficient number, since it is larger than the sum of its proper divisors (4736402603).

12121474645 is an equidigital number, since it uses as much as digits as its factorization.

12121474645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4877940.

The product of its digits is 53760, while the sum is 37.

Adding to 12121474645 its reverse (54647412121), we get a palindrome (66768886766).

The spelling of 12121474645 in words is "twelve billion, one hundred twenty-one million, four hundred seventy-four thousand, six hundred forty-five".