2115543551121 has 144 divisors (see below), whose sum is σ = 4245690572032. Its totient is φ = 987027275520.

The previous prime is 2115543551089. The next prime is 2115543551153. The reversal of 2115543551121 is 1211553455112.

2115543551121 is a `hidden beast` number, since 2 + 1 + 1 + 55 + 43 + 551 + 12 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2115543551089) and next prime (2115543551153).

It is not a de Polignac number, because 2115543551121 - 2⁵ = 2115543551089 is a prime.

It is a super-2 number, since 2×2115543551121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2115543551221) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3378180 + ... + 3955146.

Almost surely, 2^{2115543551121} is an apocalyptic number.

2115543551121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2115543551121 is an abundant number, since it is smaller than the sum of its proper divisors (2130147020911).

2115543551121 is a wasteful number, since it uses less digits than its factorization.

2115543551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577052 (or 577038 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The spelling of 2115543551121 in words is "two trillion, one hundred fifteen billion, five hundred forty-three million, five hundred fifty-one thousand, one hundred twenty-one".