12055111656621 has 16 divisors (see below), whose sum is σ = 17599411596288. Its totient is φ = 7279168388400.

The previous prime is 12055111656607. The next prime is 12055111656659. The reversal of 12055111656621 is 12665611155021.

It is not a de Polignac number, because 12055111656621 - 2¹³ = 12055111648429 is a prime.

It is a super-2 number, since 2×12055111656621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12055111657621) 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, 673988131 + ... + 674006016.

It is an arithmetic number, because the mean of its divisors is an integer number (1099963224768).

Almost surely, 2^{12055111656621} is an apocalyptic number.

12055111656621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12055111656621 is a deficient number, since it is larger than the sum of its proper divisors (5544299939667).

12055111656621 is a wasteful number, since it uses less digits than its factorization.

12055111656621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347994432.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 12055111656621 in words is "twelve trillion, fifty-five billion, one hundred eleven million, six hundred fifty-six thousand, six hundred twenty-one".