2113021620 has 96 divisors (see below), whose sum is σ = 6580896000. Its totient is φ = 562868352.

The previous prime is 2113021583. The next prime is 2113021627. The reversal of 2113021620 is 261203112.

2113021620 is a `hidden beast` number, since 2 + 11 + 30 + 2 + 1 + 620 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2113021593 and 2113021602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113021627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 754062 + ... + 756858.

It is an arithmetic number, because the mean of its divisors is an integer number (68551000).

Almost surely, 2^2113021620 is an apocalyptic number.

2113021620 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 2113021620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3290448000).

2113021620 is an abundant number, since it is smaller than the sum of its proper divisors (4467874380).

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

2113021620 is a wasteful number, since it uses less digits than its factorization.

2113021620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214 (or 4206 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2113021620 is about 45967.6149044085. The cubic root of 2113021620 is about 1283.2205724654.

Adding to 2113021620 its reverse (261203112), we get a palindrome (2374224732).

The spelling of 2113021620 in words is "two billion, one hundred thirteen million, twenty-one thousand, six hundred twenty".