1303521216 has 56 divisors (see below), whose sum is σ = 3452926800. Its totient is φ = 433999872.

The previous prime is 1303521199. The next prime is 1303521227. The reversal of 1303521216 is 6121253031.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 184110 + ... + 191058.

Almost surely, 2^1303521216 is an apocalyptic number.

1303521216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1303521216 is an abundant number, since it is smaller than the sum of its proper divisors (2149405584).

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

1303521216 is an equidigital number, since it uses as much as digits as its factorization.

1303521216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941 (or 7931 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1303521216 is about 36104.3102136019. The cubic root of 1303521216 is about 1092.3773870393.

Adding to 1303521216 its reverse (6121253031), we get a palindrome (7424774247).

The spelling of 1303521216 in words is "one billion, three hundred three million, five hundred twenty-one thousand, two hundred sixteen".