2121601 has 2 divisors, whose sum is σ = 2121602. Its totient is φ = 2121600.

The previous prime is 2121569. The next prime is 2121607. The reversal of 2121601 is 1061212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 998001 = 1060^2 + 999^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121601 - 2⁵ = 2121569 is a prime.

2121601 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2121607) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060800 + 1060801.

It is an arithmetic number, because the mean of its divisors is an integer number (1060801).

2^2121601 is an apocalyptic number.

It is an amenable number.

2121601 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121601 is an equidigital number, since it uses as much as digits as its factorization.

2121601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2121601 is about 1456.5716597545. The cubic root of 2121601 is about 128.4954956104.

Adding to 2121601 its reverse (1061212), we get a palindrome (3182813).

It can be divided in two parts, 2121 and 601, that multiplied together give a palindrome (1274721).

The spelling of 2121601 in words is "two million, one hundred twenty-one thousand, six hundred one".