2011571121 has 32 divisors (see below), whose sum is σ = 3350274048. Its totient is φ = 1046949120.

The previous prime is 2011571117. The next prime is 2011571123. The reversal of 2011571121 is 1211751102.

It is not a de Polignac number, because 2011571121 - 2² = 2011571117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2011571123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79815 + ... + 101948.

It is an arithmetic number, because the mean of its divisors is an integer number (104696064).

Almost surely, 2^2011571121 is an apocalyptic number.

2011571121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2011571121 is a deficient number, since it is larger than the sum of its proper divisors (1338702927).

2011571121 is a wasteful number, since it uses less digits than its factorization.

2011571121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181821.

The product of its (nonzero) digits is 140, while the sum is 21.

The square root of 2011571121 is about 44850.5420368584. The cubic root of 2011571121 is about 1262.3461621657.

The spelling of 2011571121 in words is "two billion, eleven million, five hundred seventy-one thousand, one hundred twenty-one".