2121493500 has 144 divisors (see below), whose sum is σ = 7648804800. Its totient is φ = 484905600.

The previous prime is 2121493453. The next prime is 2121493511. The reversal of 2121493500 is 53941212.

2121493500 is a `hidden beast` number, since 2 + 12 + 149 + 3 + 500 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2175 + ... + 65174.

It is an arithmetic number, because the mean of its divisors is an integer number (53116700).

Almost surely, 2^2121493500 is an apocalyptic number.

2121493500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121493500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3824402400).

2121493500 is an abundant number, since it is smaller than the sum of its proper divisors (5527311300).

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

2121493500 is a wasteful number, since it uses less digits than its factorization.

2121493500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67381 (or 67366 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2121493500 is about 46059.6732511207. The cubic root of 2121493500 is about 1284.9332531556.

The spelling of 2121493500 in words is "two billion, one hundred twenty-one million, four hundred ninety-three thousand, five hundred".