2021613606 has 64 divisors (see below), whose sum is σ = 4671691200. Its totient is φ = 647232768.

The previous prime is 2021613593. The next prime is 2021613611. The reversal of 2021613606 is 6063161202.

2021613606 is a `hidden beast` number, since 20 + 21 + 6 + 13 + 606 = 666.

2021613606 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021613606.

It is a congruent number.

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, 305226 + ... + 311778.

It is an arithmetic number, because the mean of its divisors is an integer number (72995175).

Almost surely, 2^2021613606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021613606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2335845600).

2021613606 is an abundant number, since it is smaller than the sum of its proper divisors (2650077594).

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

2021613606 is a wasteful number, since it uses less digits than its factorization.

2021613606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6790 (or 6784 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 2021613606 is about 44962.3576561550. The cubic root of 2021613606 is about 1264.4433710563.

Adding to 2021613606 its reverse (6063161202), we get a palindrome (8084774808).

The spelling of 2021613606 in words is "two billion, twenty-one million, six hundred thirteen thousand, six hundred six".