7051978721 has 8 divisors (see below), whose sum is σ = 7260288000. Its totient is φ = 6845398560.

The previous prime is 7051978651. The next prime is 7051978723. The reversal of 7051978721 is 1278791507.

7051978721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7051978721 - 2¹⁸ = 7051716577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7051978723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424001 + ... + 440318.

It is an arithmetic number, because the mean of its divisors is an integer number (907536000).

Almost surely, 2^7051978721 is an apocalyptic number.

It is an amenable number.

7051978721 is a deficient number, since it is larger than the sum of its proper divisors (208309279).

7051978721 is a wasteful number, since it uses less digits than its factorization.

7051978721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864559.

The product of its (nonzero) digits is 246960, while the sum is 47.

The square root of 7051978721 is about 83976.0604041414. The cubic root of 7051978721 is about 1917.6543549347.

The spelling of 7051978721 in words is "seven billion, fifty-one million, nine hundred seventy-eight thousand, seven hundred twenty-one".