12216521570 has 16 divisors (see below), whose sum is σ = 23988806208. Its totient is φ = 4442371440.

The previous prime is 12216521539. The next prime is 12216521573. The reversal of 12216521570 is 7512561221.

It is not an unprimeable number, because it can be changed into a prime (12216521573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55529534 + ... + 55529753.

It is an arithmetic number, because the mean of its divisors is an integer number (1499300388).

Almost surely, 2^12216521570 is an apocalyptic number.

12216521570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12216521570 is a deficient number, since it is larger than the sum of its proper divisors (11772284638).

12216521570 is a wasteful number, since it uses less digits than its factorization.

12216521570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111059305.

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 12216521570 in words is "twelve billion, two hundred sixteen million, five hundred twenty-one thousand, five hundred seventy".