2123398218920 has 32 divisors (see below), whose sum is σ = 5211977447520. Its totient is φ = 772144806720.

The previous prime is 2123398218899. The next prime is 2123398218959. The reversal of 2123398218920 is 298128933212.

It is a happy number.

It is a super-2 number, since 2×2123398218920² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2412952082 + ... + 2412952961.

It is an arithmetic number, because the mean of its divisors is an integer number (162874295235).

Almost surely, 2^{2123398218920} is an apocalyptic number.

2123398218920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123398218920 is an abundant number, since it is smaller than the sum of its proper divisors (3088579228600).

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

2123398218920 is a wasteful number, since it uses less digits than its factorization.

2123398218920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825905065 (or 4825905061 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 2123398218920 in words is "two trillion, one hundred twenty-three billion, three hundred ninety-eight million, two hundred eighteen thousand, nine hundred twenty".