1321125215 has 8 divisors (see below), whose sum is σ = 1589228880. Its totient is φ = 1054314432.

The previous prime is 1321125173. The next prime is 1321125217. The reversal of 1321125215 is 5125211231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321125215 - 2⁶ = 1321125151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321125217) 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, 320969 + ... + 325058.

It is an arithmetic number, because the mean of its divisors is an integer number (198653610).

Almost surely, 2^1321125215 is an apocalyptic number.

1321125215 is a deficient number, since it is larger than the sum of its proper divisors (268103665).

1321125215 is an equidigital number, since it uses as much as digits as its factorization.

1321125215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646441.

The product of its digits is 600, while the sum is 23.

The square root of 1321125215 is about 36347.2862123158. The cubic root of 1321125215 is about 1097.2729182546.

Adding to 1321125215 its reverse (5125211231), we get a palindrome (6446336446).

The spelling of 1321125215 in words is "one billion, three hundred twenty-one million, one hundred twenty-five thousand, two hundred fifteen".