2155021551311 has 8 divisors (see below), whose sum is σ = 2195722988064. Its totient is φ = 2114321620320.

The previous prime is 2155021551289. The next prime is 2155021551313. The reversal of 2155021551311 is 1131551205512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155021551311 - 2¹⁰ = 2155021550287 is a prime.

It is a super-2 number, since 2×2155021551311² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155021551313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2756921 + ... + 3451181.

It is an arithmetic number, because the mean of its divisors is an integer number (274465373508).

Almost surely, 2^{2155021551311} is an apocalyptic number.

2155021551311 is a deficient number, since it is larger than the sum of its proper divisors (40701436753).

2155021551311 is an equidigital number, since it uses as much as digits as its factorization.

2155021551311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752881.

The product of its (nonzero) digits is 7500, while the sum is 32.

Adding to 2155021551311 its reverse (1131551205512), we get a palindrome (3286572756823).

The spelling of 2155021551311 in words is "two trillion, one hundred fifty-five billion, twenty-one million, five hundred fifty-one thousand, three hundred eleven".