12421443561655 has 16 divisors (see below), whose sum is σ = 15001082576064. Its totient is φ = 9873591436800.

The previous prime is 12421443561643. The next prime is 12421443561767. The reversal of 12421443561655 is 55616534412421.

It is not a de Polignac number, because 12421443561655 - 2⁵ = 12421443561623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12421443561599 and 12421443561608.

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, 31544230 + ... + 31935580.

It is an arithmetic number, because the mean of its divisors is an integer number (937567661004).

Almost surely, 2^{12421443561655} is an apocalyptic number.

12421443561655 is a deficient number, since it is larger than the sum of its proper divisors (2579639014409).

12421443561655 is a wasteful number, since it uses less digits than its factorization.

12421443561655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431946.

The product of its digits is 3456000, while the sum is 49.

The spelling of 12421443561655 in words is "twelve trillion, four hundred twenty-one billion, four hundred forty-three million, five hundred sixty-one thousand, six hundred fifty-five".