2021653 has 2 divisors, whose sum is σ = 2021654. Its totient is φ = 2021652.

The previous prime is 2021651. The next prime is 2021659. The reversal of 2021653 is 3561202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096209 + 925444 = 1047^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021653 - 2¹ = 2021651 is a prime.

Together with 2021651, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2021653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010826 + 1010827.

It is an arithmetic number, because the mean of its divisors is an integer number (1010827).

2^2021653 is an apocalyptic number.

It is an amenable number.

2021653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021653 is an equidigital number, since it uses as much as digits as its factorization.

2021653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2021653 is about 1421.8484448070. The cubic root of 2021653 is about 126.4451584159.

Adding to 2021653 its reverse (3561202), we get a palindrome (5582855).

The spelling of 2021653 in words is "two million, twenty-one thousand, six hundred fifty-three".