7950021 has 4 divisors (see below), whose sum is σ = 10600032. Its totient is φ = 5300012.

The previous prime is 7950001. The next prime is 7950109. The reversal of 7950021 is 1200597.

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: 1200597 = 3 ⋅400199.

It is a cyclic number.

It is not a de Polignac number, because 7950021 - 2¹⁵ = 7917253 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7949973 and 7950000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7950001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325001 + ... + 1325006.

It is an arithmetic number, because the mean of its divisors is an integer number (2650008).

Almost surely, 2^7950021 is an apocalyptic number.

It is an amenable number.

7950021 is a deficient number, since it is larger than the sum of its proper divisors (2650011).

7950021 is a wasteful number, since it uses less digits than its factorization.

7950021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650010.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 7950021 is about 2819.5781599381. The cubic root of 7950021 is about 199.5826379839.

The spelling of 7950021 in words is "seven million, nine hundred fifty thousand, twenty-one".