2155604544321 has 16 divisors (see below), whose sum is σ = 3043259414784. Its totient is φ = 1352512629504.

The previous prime is 2155604544283. The next prime is 2155604544461. The reversal of 2155604544321 is 1234454065512.

It is not a de Polignac number, because 2155604544321 - 2⁹ = 2155604543809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155604542321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2864760 + ... + 3538086.

It is an arithmetic number, because the mean of its divisors is an integer number (190203713424).

Almost surely, 2^{2155604544321} is an apocalyptic number.

It is an amenable number.

2155604544321 is a deficient number, since it is larger than the sum of its proper divisors (887654870463).

2155604544321 is a wasteful number, since it uses less digits than its factorization.

2155604544321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736120.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 2155604544321 in words is "two trillion, one hundred fifty-five billion, six hundred four million, five hundred forty-four thousand, three hundred twenty-one".