12212109978 has 16 divisors (see below), whose sum is σ = 24425392320. Its totient is φ = 4070507936.

The previous prime is 12212109971. The next prime is 12212110003. The reversal of 12212109978 is 87990121221.

12212109978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12212109978² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12212109971) 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 7 ways as a sum of consecutive naturals, for example, 146926 + ... + 214502.

It is an arithmetic number, because the mean of its divisors is an integer number (1526587020).

Almost surely, 2^12212109978 is an apocalyptic number.

12212109978 is an abundant number, since it is smaller than the sum of its proper divisors (12213282342).

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

12212109978 is a wasteful number, since it uses less digits than its factorization.

12212109978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97701.

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 12212109978 in words is "twelve billion, two hundred twelve million, one hundred nine thousand, nine hundred seventy-eight".