120280021 has 4 divisors (see below), whose sum is σ = 120463200. Its totient is φ = 120096844.

The previous prime is 120279961. The next prime is 120280057. The reversal of 120280021 is 120082021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120082021 = 3881 ⋅30941.

It is a cyclic number.

It is not a de Polignac number, because 120280021 - 2¹¹ = 120277973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120279977 and 120280004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120287021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90601 + ... + 91918.

It is an arithmetic number, because the mean of its divisors is an integer number (30115800).

Almost surely, 2^120280021 is an apocalyptic number.

It is an amenable number.

120280021 is a deficient number, since it is larger than the sum of its proper divisors (183179).

120280021 is an equidigital number, since it uses as much as digits as its factorization.

120280021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183178.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 120280021 is about 10967.2248540823. The cubic root of 120280021 is about 493.6257785882.

The spelling of 120280021 in words is "one hundred twenty million, two hundred eighty thousand, twenty-one".