120231821 has 2 divisors, whose sum is σ = 120231822. Its totient is φ = 120231820.

The previous prime is 120231779. The next prime is 120231823. The reversal of 120231821 is 128132021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101404900 + 18826921 = 10070^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 120231821 - 2⁶ = 120231757 is a prime.

Together with 120231823, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 120231793 and 120231802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120231823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60115910 + 60115911.

It is an arithmetic number, because the mean of its divisors is an integer number (60115911).

Almost surely, 2^120231821 is an apocalyptic number.

It is an amenable number.

120231821 is a deficient number, since it is larger than the sum of its proper divisors (1).

120231821 is an equidigital number, since it uses as much as digits as its factorization.

120231821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 120231821 is about 10965.0271773489. The cubic root of 120231821 is about 493.5598326364.

Adding to 120231821 its reverse (128132021), we get a palindrome (248363842).

The spelling of 120231821 in words is "one hundred twenty million, two hundred thirty-one thousand, eight hundred twenty-one".