120666421 has 2 divisors, whose sum is σ = 120666422. Its totient is φ = 120666420.

The previous prime is 120666341. The next prime is 120666431. The reversal of 120666421 is 124666021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108451396 + 12215025 = 10414^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 120666421 - 2¹¹ = 120664373 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120666421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120666431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60333210 + 60333211.

It is an arithmetic number, because the mean of its divisors is an integer number (60333211).

Almost surely, 2^120666421 is an apocalyptic number.

It is an amenable number.

120666421 is a deficient number, since it is larger than the sum of its proper divisors (1).

120666421 is an equidigital number, since it uses as much as digits as its factorization.

120666421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 120666421 is about 10984.8268534374. The cubic root of 120666421 is about 494.1538050918.

The spelling of 120666421 in words is "one hundred twenty million, six hundred sixty-six thousand, four hundred twenty-one".