2121131131 has 4 divisors (see below), whose sum is σ = 2424149872. Its totient is φ = 1818112392.

The previous prime is 2121131113. The next prime is 2121131147. The reversal of 2121131131 is 1311311212.

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 2121131131 - 2⁷ = 2121131003 is a prime.

It is a super-2 number, since 2×2121131131² = 8998394549794678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121131431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151509360 + ... + 151509373.

It is an arithmetic number, because the mean of its divisors is an integer number (606037468).

Almost surely, 2^2121131131 is an apocalyptic number.

2121131131 is a deficient number, since it is larger than the sum of its proper divisors (303018741).

2121131131 is an equidigital number, since it uses as much as digits as its factorization.

2121131131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303018740.

The product of its digits is 36, while the sum is 16.

The square root of 2121131131 is about 46055.7393926099. The cubic root of 2121131131 is about 1284.8600898407.

Adding to 2121131131 its reverse (1311311212), we get a palindrome (3432442343).

The spelling of 2121131131 in words is "two billion, one hundred twenty-one million, one hundred thirty-one thousand, one hundred thirty-one".