131221030 has 32 divisors (see below), whose sum is σ = 249350400. Its totient is φ = 49581792.

The previous prime is 131221021. The next prime is 131221037. The reversal of 131221030 is 30122131.

It is a self number, because there is not a number n which added to its sum of digits gives 131221030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83391 + ... + 84949.

It is an arithmetic number, because the mean of its divisors is an integer number (7792200).

Almost surely, 2^131221030 is an apocalyptic number.

131221030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221030 is a deficient number, since it is larger than the sum of its proper divisors (118129370).

131221030 is a wasteful number, since it uses less digits than its factorization.

131221030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 131221030 is about 11455.1748131576. The cubic root of 131221030 is about 508.1607851768.

Adding to 131221030 its reverse (30122131), we get a palindrome (161343161).

The spelling of 131221030 in words is "one hundred thirty-one million, two hundred twenty-one thousand, thirty".