131421220 has 48 divisors (see below), whose sum is σ = 333970560. Its totient is φ = 42407424.

The previous prime is 131421217. The next prime is 131421221. The reversal of 131421220 is 22124131.

It is a junction number, because it is equal to n+sod(n) for n = 131421194 and 131421203.

It is not an unprimeable number, because it can be changed into a prime (131421221) 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, 25230 + ... + 29989.

It is an arithmetic number, because the mean of its divisors is an integer number (6957720).

Almost surely, 2^131421220 is an apocalyptic number.

131421220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131421220 is an abundant number, since it is smaller than the sum of its proper divisors (202549340).

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

131421220 is a wasteful number, since it uses less digits than its factorization.

131421220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55252 (or 55250 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 131421220 is about 11463.9094553298. The cubic root of 131421220 is about 508.4190695365.

Adding to 131421220 its reverse (22124131), we get a palindrome (153545351).

The spelling of 131421220 in words is "one hundred thirty-one million, four hundred twenty-one thousand, two hundred twenty".