120365126621 has 4 divisors (see below), whose sum is σ = 121060878972. Its totient is φ = 119669374272.

The previous prime is 120365126599. The next prime is 120365126641. The reversal of 120365126621 is 126621563021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126621563021 = 1069 ⋅118448609.

It can be written as a sum of positive squares in 2 ways, for example, as 82606807396 + 37758319225 = 287414^2 + 194315^2 .

It is a cyclic number.

It is not a de Polignac number, because 120365126621 - 2¹⁴ = 120365110237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120365126641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347875916 + ... + 347876261.

It is an arithmetic number, because the mean of its divisors is an integer number (30265219743).

Almost surely, 2^120365126621 is an apocalyptic number.

It is an amenable number.

120365126621 is a deficient number, since it is larger than the sum of its proper divisors (695752351).

120365126621 is an equidigital number, since it uses as much as digits as its factorization.

120365126621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695752350.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 120365126621 its reverse (126621563021), we get a palindrome (246986689642).

The spelling of 120365126621 in words is "one hundred twenty billion, three hundred sixty-five million, one hundred twenty-six thousand, six hundred twenty-one".