12121154441 has 16 divisors (see below), whose sum is σ = 13519491840. Its totient is φ = 10772743680.

The previous prime is 12121154417. The next prime is 12121154477. The reversal of 12121154441 is 14445112121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121154441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121154441.

It is not an unprimeable number, because it can be changed into a prime (12121154341) 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, 467675 + ... + 492911.

It is an arithmetic number, because the mean of its divisors is an integer number (844968240).

Almost surely, 2^12121154441 is an apocalyptic number.

12121154441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121154441 is a deficient number, since it is larger than the sum of its proper divisors (1398337399).

12121154441 is a wasteful number, since it uses less digits than its factorization.

12121154441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26224.

The product of its digits is 1280, while the sum is 26.

Adding to 12121154441 its reverse (14445112121), we get a palindrome (26566266562).

The spelling of 12121154441 in words is "twelve billion, one hundred twenty-one million, one hundred fifty-four thousand, four hundred forty-one".