2155535102321 has 4 divisors (see below), whose sum is σ = 2158044457200. Its totient is φ = 2153025747444.

The previous prime is 2155535102291. The next prime is 2155535102363. The reversal of 2155535102321 is 1232015355512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155535102321 - 2⁶ = 2155535102257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155535102221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254676151 + ... + 1254677868.

It is an arithmetic number, because the mean of its divisors is an integer number (539511114300).

Almost surely, 2^{2155535102321} is an apocalyptic number.

It is an amenable number.

2155535102321 is a deficient number, since it is larger than the sum of its proper divisors (2509354879).

2155535102321 is an equidigital number, since it uses as much as digits as its factorization.

2155535102321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509354878.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 2155535102321 in words is "two trillion, one hundred fifty-five billion, five hundred thirty-five million, one hundred two thousand, three hundred twenty-one".