2118729420 has 96 divisors (see below), whose sum is σ = 6632317440. Its totient is φ = 561504960.

The previous prime is 2118729373. The next prime is 2118729449. The reversal of 2118729420 is 249278112.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75985 + ... + 100055.

It is an arithmetic number, because the mean of its divisors is an integer number (69086640).

Almost surely, 2^2118729420 is an apocalyptic number.

2118729420 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 2118729420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3316158720).

2118729420 is an abundant number, since it is smaller than the sum of its proper divisors (4513588020).

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

2118729420 is a wasteful number, since it uses less digits than its factorization.

2118729420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24252 (or 24244 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 2118729420 is about 46029.6580478283. The cubic root of 2118729420 is about 1284.3749669135.

The spelling of 2118729420 in words is "two billion, one hundred eighteen million, seven hundred twenty-nine thousand, four hundred twenty".