1171221320 has 32 divisors (see below), whose sum is σ = 2637585720. Its totient is φ = 468072960.

The previous prime is 1171221301. The next prime is 1171221329. The reversal of 1171221320 is 231221711.

It can be written as a sum of positive squares in 4 ways, for example, as 1159674916 + 11546404 = 34054^2 + 3398^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1171221292 and 1171221301.

It is not an unprimeable number, because it can be changed into a prime (1171221329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34844 + ... + 59636.

Almost surely, 2^1171221320 is an apocalyptic number.

1171221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1171221320 is an abundant number, since it is smaller than the sum of its proper divisors (1466364400).

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

1171221320 is a wasteful number, since it uses less digits than its factorization.

1171221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25985 (or 25981 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1171221320 is about 34223.1109047673. The cubic root of 1171221320 is about 1054.0947649217.

The spelling of 1171221320 in words is "one billion, one hundred seventy-one million, two hundred twenty-one thousand, three hundred twenty".