120256621 has 2 divisors, whose sum is σ = 120256622. Its totient is φ = 120256620.

The previous prime is 120256613. The next prime is 120256639. The reversal of 120256621 is 126652021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109432521 + 10824100 = 10461^2 + 3290^2 .

It is an emirp because it is prime and its reverse (126652021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120256621 - 2³ = 120256613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120253621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60128310 + 60128311.

It is an arithmetic number, because the mean of its divisors is an integer number (60128311).

Almost surely, 2^120256621 is an apocalyptic number.

It is an amenable number.

120256621 is a deficient number, since it is larger than the sum of its proper divisors (1).

120256621 is an equidigital number, since it uses as much as digits as its factorization.

120256621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 120256621 is about 10966.1579871895. The cubic root of 120256621 is about 493.5937655344.

The spelling of 120256621 in words is "one hundred twenty million, two hundred fifty-six thousand, six hundred twenty-one".