2121112131 has 4 divisors (see below), whose sum is σ = 2828149512. Its totient is φ = 1414074752.

The previous prime is 2121112093. The next prime is 2121112157. The reversal of 2121112131 is 1312111212.

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 2121112131 - 2²¹ = 2119014979 is a prime.

It is a super-2 number, since 2×2121112131² = 8998233344550722322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121112131.

It is not an unprimeable number, because it can be changed into a prime (2121112181) 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, 353518686 + ... + 353518691.

It is an arithmetic number, because the mean of its divisors is an integer number (707037378).

Almost surely, 2^2121112131 is an apocalyptic number.

2121112131 is a deficient number, since it is larger than the sum of its proper divisors (707037381).

2121112131 is an equidigital number, since it uses as much as digits as its factorization.

2121112131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707037380.

The product of its digits is 24, while the sum is 15.

The square root of 2121112131 is about 46055.5331203537. The cubic root of 2121112131 is about 1284.8562534577.

Adding to 2121112131 its reverse (1312111212), we get a palindrome (3433223343).

The spelling of 2121112131 in words is "two billion, one hundred twenty-one million, one hundred twelve thousand, one hundred thirty-one".