131221213000 has 32 divisors (see below), whose sum is σ = 307057640760. Its totient is φ = 52488484800.

The previous prime is 131221212971. The next prime is 131221213009. The reversal of 131221213000 is 312122131.

It can be written as a sum of positive squares in 4 ways, for example, as 7143968484 + 124077244516 = 84522^2 + 352246^2 .

It is not an unprimeable number, because it can be changed into a prime (131221213009) 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 7 ways as a sum of consecutive naturals, for example, 65609607 + ... + 65611606.

Almost surely, 2^131221213000 is an apocalyptic number.

131221213000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131221213000 is an abundant number, since it is smaller than the sum of its proper divisors (175836427760).

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

131221213000 is a wasteful number, since it uses less digits than its factorization.

131221213000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131221234 (or 131221220 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 131221213000 its reverse (312122131), we get a palindrome (131533335131).

The spelling of 131221213000 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand".