120725021 has 4 divisors (see below), whose sum is σ = 121832700. Its totient is φ = 119617344.

The previous prime is 120724957. The next prime is 120725023. The reversal of 120725021 is 120527021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31516996 + 89208025 = 5614^2 + 9445^2 .

It is a cyclic number.

It is not a de Polignac number, because 120725021 - 2⁶ = 120724957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120724984 and 120725002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120725023) 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, 553676 + ... + 553893.

It is an arithmetic number, because the mean of its divisors is an integer number (30458175).

Almost surely, 2^120725021 is an apocalyptic number.

It is an amenable number.

120725021 is a deficient number, since it is larger than the sum of its proper divisors (1107679).

120725021 is a wasteful number, since it uses less digits than its factorization.

120725021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107678.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 120725021 is about 10987.4938452770. The cubic root of 120725021 is about 494.2337851625.

The spelling of 120725021 in words is "one hundred twenty million, seven hundred twenty-five thousand, twenty-one".