2131355684 has 24 divisors (see below), whose sum is σ = 3769899840. Its totient is φ = 1054269216.

The previous prime is 2131355663. The next prime is 2131355701. The reversal of 2131355684 is 4865531312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351809 + ... + 357815.

It is an arithmetic number, because the mean of its divisors is an integer number (157079160).

Almost surely, 2^2131355684 is an apocalyptic number.

It is an amenable number.

2131355684 is a deficient number, since it is larger than the sum of its proper divisors (1638544156).

2131355684 is a wasteful number, since it uses less digits than its factorization.

2131355684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947 (or 6945 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 2131355684 is about 46166.6078892526. The cubic root of 2131355684 is about 1286.9212649406.

Adding to 2131355684 its reverse (4865531312), we get a palindrome (6996886996).

The spelling of 2131355684 in words is "two billion, one hundred thirty-one million, three hundred fifty-five thousand, six hundred eighty-four".