1321253015 has 8 divisors (see below), whose sum is σ = 1636649088. Its totient is φ = 1022905440.

The previous prime is 1321252981. The next prime is 1321253023. The reversal of 1321253015 is 5103521231.

It is a happy number.

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

It is not a de Polignac number, because 1321253015 - 2¹⁰ = 1321251991 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 4261952 + ... + 4262261.

It is an arithmetic number, because the mean of its divisors is an integer number (204581136).

Almost surely, 2^1321253015 is an apocalyptic number.

1321253015 is a deficient number, since it is larger than the sum of its proper divisors (315396073).

1321253015 is an equidigital number, since it uses as much as digits as its factorization.

1321253015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8524249.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1321253015 is about 36349.0442102678. The cubic root of 1321253015 is about 1097.3082989427.

Adding to 1321253015 its reverse (5103521231), we get a palindrome (6424774246).

The spelling of 1321253015 in words is "one billion, three hundred twenty-one million, two hundred fifty-three thousand, fifteen".