131821012 has 24 divisors (see below), whose sum is σ = 243432000. Its totient is φ = 62286336.

The previous prime is 131821007. The next prime is 131821013. The reversal of 131821012 is 210128131.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131821013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32193 + ... + 36055.

It is an arithmetic number, because the mean of its divisors is an integer number (10143000).

Almost surely, 2^131821012 is an apocalyptic number.

It is an amenable number.

131821012 is a deficient number, since it is larger than the sum of its proper divisors (111610988).

131821012 is a wasteful number, since it uses less digits than its factorization.

131821012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335 (or 4333 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 131821012 is about 11481.3331978477. Note that the first 3 decimals coincide. The cubic root of 131821012 is about 508.9340957306.

Adding to 131821012 its reverse (210128131), we get a palindrome (341949143).

The spelling of 131821012 in words is "one hundred thirty-one million, eight hundred twenty-one thousand, twelve".