12121122121040 has 40 divisors (see below), whose sum is σ = 28181971176648. Its totient is φ = 4848386526720.

The previous prime is 12121122121039. The next prime is 12121122121067. The reversal of 12121122121040 is 4012122112121.

It can be written as a sum of positive squares in 4 ways, for example, as 1514740639504 + 10606381481536 = 1230748^2 + 3256744^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5561294 + ... + 7427666.

Almost surely, 2^{12121122121040} is an apocalyptic number.

12121122121040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121122121040 is an abundant number, since it is smaller than the sum of its proper divisors (16060849055608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121122121040 is a wasteful number, since it uses less digits than its factorization.

12121122121040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947567 (or 1947561 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12121122121040 its reverse (4012122112121), we get a palindrome (16133244233161).

The spelling of 12121122121040 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, forty".