1271522220 has 48 divisors (see below), whose sum is σ = 3561815040. Its totient is φ = 338924736.

The previous prime is 1271522207. The next prime is 1271522221. The reversal of 1271522220 is 222251721.

It is not an unprimeable number, because it can be changed into a prime (1271522221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250629 + ... + 255651.

It is an arithmetic number, because the mean of its divisors is an integer number (74204480).

Almost surely, 2^1271522220 is an apocalyptic number.

1271522220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271522220 is an abundant number, since it is smaller than the sum of its proper divisors (2290292820).

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

1271522220 is a wasteful number, since it uses less digits than its factorization.

1271522220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9254 (or 9252 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 1271522220 is about 35658.4102281636. The cubic root of 1271522220 is about 1083.3646269987.

Adding to 1271522220 its reverse (222251721), we get a palindrome (1493773941).

The spelling of 1271522220 in words is "one billion, two hundred seventy-one million, five hundred twenty-two thousand, two hundred twenty".