2155012111 has 24 divisors (see below), whose sum is σ = 2611662480. Its totient is φ = 1771459200.

The previous prime is 2155012109. The next prime is 2155012121. The reversal of 2155012111 is 1112105512.

It is not a de Polignac number, because 2155012111 - 2¹ = 2155012109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155012121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109441 + ... + 127621.

It is an arithmetic number, because the mean of its divisors is an integer number (108819270).

Almost surely, 2^2155012111 is an apocalyptic number.

2155012111 is a deficient number, since it is larger than the sum of its proper divisors (456650369).

2155012111 is a wasteful number, since it uses less digits than its factorization.

2155012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295 (or 18288 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 19.

The square root of 2155012111 is about 46422.1079982372. The cubic root of 2155012111 is about 1291.6650396335.

Adding to 2155012111 its reverse (1112105512), we get a palindrome (3267117623).

The spelling of 2155012111 in words is "two billion, one hundred fifty-five million, twelve thousand, one hundred eleven".