2112421500 has 144 divisors (see below), whose sum is σ = 7616097216. Its totient is φ = 482832000.

The previous prime is 2112421489. The next prime is 2112421511. The reversal of 2112421500 is 51242112.

2112421500 is a `hidden beast` number, since 21 + 124 + 21 + 500 = 666.

It is an interprime number because it is at equal distance from previous prime (2112421489) and next prime (2112421511).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 2031 + ... + 65030.

It is an arithmetic number, because the mean of its divisors is an integer number (52889564).

Almost surely, 2^2112421500 is an apocalyptic number.

2112421500 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 2112421500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3808048608).

2112421500 is an abundant number, since it is smaller than the sum of its proper divisors (5503675716).

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

2112421500 is a wasteful number, since it uses less digits than its factorization.

2112421500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67093 (or 67078 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2112421500 is about 45961.0868017718. The cubic root of 2112421500 is about 1283.0990783235.

Adding to 2112421500 its reverse (51242112), we get a palindrome (2163663612).

It can be divided in two parts, 21124 and 21500, that added together give a palindrome (42624).

The spelling of 2112421500 in words is "two billion, one hundred twelve million, four hundred twenty-one thousand, five hundred".