2123198840 has 32 divisors (see below), whose sum is σ = 5459654880. Its totient is φ = 727953792.

The previous prime is 2123198813. The next prime is 2123198851. The reversal of 2123198840 is 488913212.

It is a junction number, because it is equal to n+sod(n) for n = 2123198794 and 2123198803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3791147 + ... + 3791706.

It is an arithmetic number, because the mean of its divisors is an integer number (170614215).

Almost surely, 2^2123198840 is an apocalyptic number.

2123198840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123198840 is an abundant number, since it is smaller than the sum of its proper divisors (3336456040).

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

2123198840 is a wasteful number, since it uses less digits than its factorization.

2123198840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7582871 (or 7582867 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 2123198840 is about 46078.1818217690. The cubic root of 2123198840 is about 1285.2774542572.

The spelling of 2123198840 in words is "two billion, one hundred twenty-three million, one hundred ninety-eight thousand, eight hundred forty".