7920006021 has 24 divisors (see below), whose sum is σ = 11557023296. Its totient is φ = 5226249600.

The previous prime is 7920006013. The next prime is 7920006043. The reversal of 7920006021 is 1206000297.

It is not a de Polignac number, because 7920006021 - 2³ = 7920006013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7920006011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 374301 + ... + 394893.

Almost surely, 2^7920006021 is an apocalyptic number.

It is an amenable number.

7920006021 is a deficient number, since it is larger than the sum of its proper divisors (3637017275).

7920006021 is a wasteful number, since it uses less digits than its factorization.

7920006021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21033 (or 21030 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 7920006021 is about 88994.4156731196. The cubic root of 7920006021 is about 1993.3114919482.

The spelling of 7920006021 in words is "seven billion, nine hundred twenty million, six thousand, twenty-one".