2101121131 has 4 divisors (see below), whose sum is σ = 2168899264. Its totient is φ = 2033343000.

The previous prime is 2101121129. The next prime is 2101121177. The reversal of 2101121131 is 1311211012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101121131 - 2¹ = 2101121129 is a prime.

It is a super-2 number, since 2×2101121131² = 8829420014269438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33889020 + ... + 33889081.

It is an arithmetic number, because the mean of its divisors is an integer number (542224816).

Almost surely, 2^2101121131 is an apocalyptic number.

2101121131 is a deficient number, since it is larger than the sum of its proper divisors (67778133).

2101121131 is an equidigital number, since it uses as much as digits as its factorization.

2101121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67778132.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2101121131 is about 45837.9878594163. The cubic root of 2101121131 is about 1280.8070128578.

Adding to 2101121131 its reverse (1311211012), we get a palindrome (3412332143).

The spelling of 2101121131 in words is "two billion, one hundred one million, one hundred twenty-one thousand, one hundred thirty-one".