131220210 has 128 divisors (see below), whose sum is σ = 360972288. Its totient is φ = 30240000.

The previous prime is 131220197. The next prime is 131220223. The reversal of 131220210 is 12022131.

It is an interprime number because it is at equal distance from previous prime (131220197) and next prime (131220223).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1033167 + ... + 1033293.

It is an arithmetic number, because the mean of its divisors is an integer number (2820096).

Almost surely, 2^131220210 is an apocalyptic number.

131220210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131220210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180486144).

131220210 is an abundant number, since it is smaller than the sum of its proper divisors (229752078).

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

131220210 is a wasteful number, since it uses less digits than its factorization.

131220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 131220210 is about 11455.1390214174. The cubic root of 131220210 is about 508.1597266759.

Adding to 131220210 its reverse (12022131), we get a palindrome (143242341).

The spelling of 131220210 in words is "one hundred thirty-one million, two hundred twenty thousand, two hundred ten".