2121001606 has 8 divisors (see below), whose sum is σ = 3182126760. Its totient is φ = 1060292688.

The previous prime is 2121001591. The next prime is 2121001613. The reversal of 2121001606 is 6061001212.

2121001606 is nontrivially palindromic in base 11.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90991 + ... + 111898.

It is an arithmetic number, because the mean of its divisors is an integer number (397765845).

Almost surely, 2^2121001606 is an apocalyptic number.

2121001606 is a deficient number, since it is larger than the sum of its proper divisors (1061125154).

2121001606 is a wasteful number, since it uses less digits than its factorization.

2121001606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208118.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2121001606 is about 46054.3331946083. Note that the first 3 decimals coincide. The cubic root of 2121001606 is about 1284.8339363593.

Adding to 2121001606 its reverse (6061001212), we get a palindrome (8182002818).

The spelling of 2121001606 in words is "two billion, one hundred twenty-one million, one thousand, six hundred six".