2121333131 has 4 divisors (see below), whose sum is σ = 2189763264. Its totient is φ = 2052903000.

The previous prime is 2121333121. The next prime is 2121333143. The reversal of 2121333131 is 1313331212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121333131 is a prime.

It is a super-2 number, since 2×2121333131² = 9000108505356526322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121333121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34215020 + ... + 34215081.

It is an arithmetic number, because the mean of its divisors is an integer number (547440816).

Almost surely, 2^2121333131 is an apocalyptic number.

2121333131 is a deficient number, since it is larger than the sum of its proper divisors (68430133).

2121333131 is an equidigital number, since it uses as much as digits as its factorization.

2121333131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68430132.

The product of its digits is 324, while the sum is 20.

The square root of 2121333131 is about 46057.9323352666. The cubic root of 2121333131 is about 1284.9008752336.

Adding to 2121333131 its reverse (1313331212), we get a palindrome (3434664343).

The spelling of 2121333131 in words is "two billion, one hundred twenty-one million, three hundred thirty-three thousand, one hundred thirty-one".