1521111216 has 40 divisors (see below), whose sum is σ = 3959550144. Its totient is φ = 503164480.

The previous prime is 1521111199. The next prime is 1521111217. The reversal of 1521111216 is 6121111251.

It is a junction number, because it is equal to n+sod(n) for n = 1521111192 and 1521111201.

It is not an unprimeable number, because it can be changed into a prime (1521111217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114666 + ... + 127241.

Almost surely, 2^1521111216 is an apocalyptic number.

1521111216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1521111216 is an abundant number, since it is smaller than the sum of its proper divisors (2438438928).

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

1521111216 is a wasteful number, since it uses less digits than its factorization.

1521111216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242049 (or 242043 counting only the distinct ones).

The product of its digits is 120, while the sum is 21.

The square root of 1521111216 is about 39001.4258200902. The cubic root of 1521111216 is about 1150.0595346621.

Adding to 1521111216 its reverse (6121111251), we get a palindrome (7642222467).

The spelling of 1521111216 in words is "one billion, five hundred twenty-one million, one hundred eleven thousand, two hundred sixteen".