1311214521 has 16 divisors (see below), whose sum is σ = 1827035136. Its totient is φ = 834882576.

The previous prime is 1311214469. The next prime is 1311214579. The reversal of 1311214521 is 1254121131.

It is not a de Polignac number, because 1311214521 - 2¹¹ = 1311212473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311212521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33216 + ... + 61038.

It is an arithmetic number, because the mean of its divisors is an integer number (114189696).

Almost surely, 2^1311214521 is an apocalyptic number.

It is an amenable number.

1311214521 is a deficient number, since it is larger than the sum of its proper divisors (515820615).

1311214521 is a wasteful number, since it uses less digits than its factorization.

1311214521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28532.

The product of its digits is 240, while the sum is 21.

The square root of 1311214521 is about 36210.6962236298. The cubic root of 1311214521 is about 1094.5222218708.

Adding to 1311214521 its reverse (1254121131), we get a palindrome (2565335652).

The spelling of 1311214521 in words is "one billion, three hundred eleven million, two hundred fourteen thousand, five hundred twenty-one".