7120021 has 8 divisors (see below), whose sum is σ = 7356800. Its totient is φ = 6885648.

The previous prime is 7120013. The next prime is 7120031. The reversal of 7120021 is 1200217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7120021 - 2³ = 7120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7119983 and 7120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7120031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6880 + ... + 7846.

It is an arithmetic number, because the mean of its divisors is an integer number (919600).

Almost surely, 2^7120021 is an apocalyptic number.

It is an amenable number.

7120021 is a deficient number, since it is larger than the sum of its proper divisors (236779).

7120021 is a wasteful number, since it uses less digits than its factorization.

7120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 7120021 is about 2668.3367478637. The cubic root of 7120021 is about 192.3802234590.

Adding to 7120021 its reverse (1200217), we get a palindrome (8320238).

The spelling of 7120021 in words is "seven million, one hundred twenty thousand, twenty-one".