1202821 has 4 divisors (see below), whose sum is σ = 1219372. Its totient is φ = 1186272.

The previous prime is 1202819. The next prime is 1202827. The reversal of 1202821 is 1282021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 540225 + 662596 = 735^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202821 - 2¹ = 1202819 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1202795 and 1202804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8166 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (304843).

2^1202821 is an apocalyptic number.

It is an amenable number.

1202821 is a deficient number, since it is larger than the sum of its proper divisors (16551).

1202821 is an equidigital number, since it uses as much as digits as its factorization.

1202821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16550.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1202821 is about 1096.7319636082. The cubic root of 1202821 is about 106.3490628574.

Adding to 1202821 its reverse (1282021), we get a palindrome (2484842).

The spelling of 1202821 in words is "one million, two hundred two thousand, eight hundred twenty-one".