2121653 has 2 divisors, whose sum is σ = 2121654. Its totient is φ = 2121652.

The previous prime is 2121631. The next prime is 2121661. The reversal of 2121653 is 3561212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1787569 + 334084 = 1337^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121653 - 2¹⁴ = 2105269 is a prime.

It is a super-2 number, since 2×2121653² = 9002822904818, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060826 + 1060827.

It is an arithmetic number, because the mean of its divisors is an integer number (1060827).

2^2121653 is an apocalyptic number.

It is an amenable number.

2121653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121653 is an equidigital number, since it uses as much as digits as its factorization.

2121653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 2121653 is about 1456.5895097796. The cubic root of 2121653 is about 128.4965454011.

Adding to 2121653 its reverse (3561212), we get a palindrome (5682865).

The spelling of 2121653 in words is "two million, one hundred twenty-one thousand, six hundred fifty-three".