7051721540 has 24 divisors (see below), whose sum is σ = 14916713112. Its totient is φ = 2800098560.

The previous prime is 7051721531. The next prime is 7051721543. The reversal of 7051721540 is 451271507.

It can be written as a sum of positive squares in 4 ways, for example, as 1775442496 + 5276279044 = 42136^2 + 72638^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7051721497 and 7051721506.

It is not an unprimeable number, because it can be changed into a prime (7051721543) 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, 1284071 + ... + 1289550.

It is an arithmetic number, because the mean of its divisors is an integer number (621529713).

Almost surely, 2^7051721540 is an apocalyptic number.

It is an amenable number.

7051721540 is an abundant number, since it is smaller than the sum of its proper divisors (7864991572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7051721540 is a wasteful number, since it uses less digits than its factorization.

7051721540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573767 (or 2573765 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 7051721540 is about 83974.5291144880. The cubic root of 7051721540 is about 1917.6310427893.

The spelling of 7051721540 in words is "seven billion, fifty-one million, seven hundred twenty-one thousand, five hundred forty".