1321571241 has 8 divisors (see below), whose sum is σ = 1957883360. Its totient is φ = 881047476.

The previous prime is 1321571219. The next prime is 1321571249. The reversal of 1321571241 is 1421751231.

It is not a de Polignac number, because 1321571241 - 2¹⁵ = 1321538473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 48947083 = 1321571241 / (1 + 3 + 2 + 1 + 5 + 7 + 1 + 2 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321571249) 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, 24473515 + ... + 24473568.

It is an arithmetic number, because the mean of its divisors is an integer number (244735420).

Almost surely, 2^1321571241 is an apocalyptic number.

It is an amenable number.

1321571241 is a deficient number, since it is larger than the sum of its proper divisors (636312119).

1321571241 is an equidigital number, since it uses as much as digits as its factorization.

1321571241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48947092 (or 48947086 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1321571241 is about 36353.4213107927. The cubic root of 1321571241 is about 1097.3963880510.

The spelling of 1321571241 in words is "one billion, three hundred twenty-one million, five hundred seventy-one thousand, two hundred forty-one".