120651821 has 2 divisors, whose sum is σ = 120651822. Its totient is φ = 120651820.

The previous prime is 120651793. The next prime is 120651823. The reversal of 120651821 is 128156021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97022500 + 23629321 = 9850^2 + 4861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120651821 is a prime.

Together with 120651823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120651823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60325910 + 60325911.

It is an arithmetic number, because the mean of its divisors is an integer number (60325911).

Almost surely, 2^120651821 is an apocalyptic number.

It is an amenable number.

120651821 is a deficient number, since it is larger than the sum of its proper divisors (1).

120651821 is an equidigital number, since it uses as much as digits as its factorization.

120651821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 120651821 is about 10984.1622803016. The cubic root of 120651821 is about 494.1338742873.

The spelling of 120651821 in words is "one hundred twenty million, six hundred fifty-one thousand, eight hundred twenty-one".