2155124420015 has 16 divisors (see below), whose sum is σ = 2955644743680. Its totient is φ = 1477776832800.

The previous prime is 2155124420003. The next prime is 2155124420021. The reversal of 2155124420015 is 5100244215512.

It is not a de Polignac number, because 2155124420015 - 2⁸ = 2155124419759 is a prime.

It is a super-2 number, since 2×2155124420015² (a number of 25 digits) contains 22 as substring.

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, 2013440 + ... + 2892090.

It is an arithmetic number, because the mean of its divisors is an integer number (184727796480).

Almost surely, 2^{2155124420015} is an apocalyptic number.

2155124420015 is a deficient number, since it is larger than the sum of its proper divisors (800520323665).

2155124420015 is an equidigital number, since it uses as much as digits as its factorization.

2155124420015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948742.

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 2155124420015 its reverse (5100244215512), we get a palindrome (7255368635527).

The spelling of 2155124420015 in words is "two trillion, one hundred fifty-five billion, one hundred twenty-four million, four hundred twenty thousand, fifteen".