120102821 has 2 divisors, whose sum is σ = 120102822. Its totient is φ = 120102820.

The previous prime is 120102809. The next prime is 120102863. The reversal of 120102821 is 128201021.

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., 114789796 + 5313025 = 10714^2 + 2305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120102821 is a prime.

It is a super-2 number, since 2×120102821² = 28849375224316082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 120102821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120102881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60051410 + 60051411.

It is an arithmetic number, because the mean of its divisors is an integer number (60051411).

Almost surely, 2^120102821 is an apocalyptic number.

It is an amenable number.

120102821 is a deficient number, since it is larger than the sum of its proper divisors (1).

120102821 is an equidigital number, since it uses as much as digits as its factorization.

120102821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 120102821 is about 10959.1432603101. The cubic root of 120102821 is about 493.3832515331.

Adding to 120102821 its reverse (128201021), we get a palindrome (248303842).

The spelling of 120102821 in words is "one hundred twenty million, one hundred two thousand, eight hundred twenty-one".