12138210798 has 32 divisors (see below), whose sum is σ = 27930700800. Its totient is φ = 3444782880.

The previous prime is 12138210779. The next prime is 12138210809. The reversal of 12138210798 is 89701283121.

It is a super-2 number, since 2×12138210798² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963558 + ... + 976073.

It is an arithmetic number, because the mean of its divisors is an integer number (872834400).

Almost surely, 2^12138210798 is an apocalyptic number.

12138210798 is an abundant number, since it is smaller than the sum of its proper divisors (15792490002).

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

12138210798 is a wasteful number, since it uses less digits than its factorization.

12138210798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939792.

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 12138210798 in words is "twelve billion, one hundred thirty-eight million, two hundred ten thousand, seven hundred ninety-eight".