12145021998 has 32 divisors (see below), whose sum is σ = 25134291360. Its totient is φ = 3907706880.

The previous prime is 12145021997. The next prime is 12145022041. The reversal of 12145021998 is 89912054121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145021997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912286 + ... + 925502.

It is an arithmetic number, because the mean of its divisors is an integer number (785446605).

Almost surely, 2^12145021998 is an apocalyptic number.

12145021998 is an abundant number, since it is smaller than the sum of its proper divisors (12989269362).

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

12145021998 is a wasteful number, since it uses less digits than its factorization.

12145021998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18532.

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 12145021998 in words is "twelve billion, one hundred forty-five million, twenty-one thousand, nine hundred ninety-eight".