1216522210 has 64 divisors (see below), whose sum is σ = 2431275264. Its totient is φ = 435916800.

The previous prime is 1216522183. The next prime is 1216522211. The reversal of 1216522210 is 122256121.

It is not an unprimeable number, because it can be changed into a prime (1216522211) 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 31 ways as a sum of consecutive naturals, for example, 941665 + ... + 942955.

It is an arithmetic number, because the mean of its divisors is an integer number (37988676).

Almost surely, 2^1216522210 is an apocalyptic number.

1216522210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216522210 is a deficient number, since it is larger than the sum of its proper divisors (1214753054).

1216522210 is a wasteful number, since it uses less digits than its factorization.

1216522210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1216522210 is about 34878.6784440007. The cubic root of 1216522210 is about 1067.5134299491.

Adding to 1216522210 its reverse (122256121), we get a palindrome (1338778331).

The spelling of 1216522210 in words is "one billion, two hundred sixteen million, five hundred twenty-two thousand, two hundred ten".