2121013131 has 4 divisors (see below), whose sum is σ = 2828017512. Its totient is φ = 1414008752.

The previous prime is 2121013129. The next prime is 2121013159. The reversal of 2121013131 is 1313101212.

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 2121013131 - 2¹ = 2121013129 is a prime.

It is a super-2 number, since 2×2121013131² = 8997393403748846322, 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 2121013131.

It is not an unprimeable number, because it can be changed into a prime (2121013031) 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, 353502186 + ... + 353502191.

It is an arithmetic number, because the mean of its divisors is an integer number (707004378).

Almost surely, 2^2121013131 is an apocalyptic number.

2121013131 is a deficient number, since it is larger than the sum of its proper divisors (707004381).

2121013131 is an equidigital number, since it uses as much as digits as its factorization.

2121013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707004380.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 2121013131 is about 46054.4583183865. The cubic root of 2121013131 is about 1284.8362635121.

Adding to 2121013131 its reverse (1313101212), we get a palindrome (3434114343).

The spelling of 2121013131 in words is "two billion, one hundred twenty-one million, thirteen thousand, one hundred thirty-one".