1211281320 has 32 divisors (see below), whose sum is σ = 3633844320. Its totient is φ = 323008320.

The previous prime is 1211281303. The next prime is 1211281343. The reversal of 1211281320 is 231821121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5046886 + ... + 5047125.

It is an arithmetic number, because the mean of its divisors is an integer number (113557635).

Almost surely, 2^1211281320 is an apocalyptic number.

1211281320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211281320 is an abundant number, since it is smaller than the sum of its proper divisors (2422563000).

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

1211281320 is a wasteful number, since it uses less digits than its factorization.

1211281320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10094025 (or 10094021 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1211281320 is about 34803.4670686700. The cubic root of 1211281320 is about 1065.9782411163.

The spelling of 1211281320 in words is "one billion, two hundred eleven million, two hundred eighty-one thousand, three hundred twenty".