7921120005 has 40 divisors (see below), whose sum is σ = 14208691200. Its totient is φ = 4221815904.

The previous prime is 7921120003. The next prime is 7921120019. The reversal of 7921120005 is 5000211297.

It is not a de Polignac number, because 7921120005 - 2¹ = 7921120003 is a prime.

It is a super-3 number, since 3×7921120005³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921120003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 706836 + ... + 717954.

It is an arithmetic number, because the mean of its divisors is an integer number (355217280).

Almost surely, 2^7921120005 is an apocalyptic number.

It is an amenable number.

7921120005 is a deficient number, since it is larger than the sum of its proper divisors (6287571195).

7921120005 is a wasteful number, since it uses less digits than its factorization.

7921120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12895 (or 12886 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 7921120005 is about 89000.6741828398. The cubic root of 7921120005 is about 1993.4049436031.

The spelling of 7921120005 in words is "seven billion, nine hundred twenty-one million, one hundred twenty thousand, five".