2131356440 has 32 divisors (see below), whose sum is σ = 4799602080. Its totient is φ = 851822592.

The previous prime is 2131356431. The next prime is 2131356463. The reversal of 2131356440 is 446531312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26789 + ... + 70571.

It is an arithmetic number, because the mean of its divisors is an integer number (149987565).

Almost surely, 2^2131356440 is an apocalyptic number.

2131356440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131356440 is an abundant number, since it is smaller than the sum of its proper divisors (2668245640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131356440 is a wasteful number, since it uses less digits than its factorization.

2131356440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45011 (or 45007 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2131356440 is about 46166.6160769879. The cubic root of 2131356440 is about 1286.9214170992.

Adding to 2131356440 its reverse (446531312), we get a palindrome (2577887752).

The spelling of 2131356440 in words is "two billion, one hundred thirty-one million, three hundred fifty-six thousand, four hundred forty".