7021752021 has 6 divisors (see below), whose sum is σ = 10142530710. Its totient is φ = 4681168008.

The previous prime is 7021751977. The next prime is 7021752053. The reversal of 7021752021 is 1202571207.

It can be written as a sum of positive squares in only one way, i.e., 6468984900 + 552767121 = 80430^2 + 23511^2 .

It is not a de Polignac number, because 7021752021 - 2¹⁰ = 7021750997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7021752121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390097326 + ... + 390097343.

It is an arithmetic number, because the mean of its divisors is an integer number (1690421785).

Almost surely, 2^7021752021 is an apocalyptic number.

It is an amenable number.

7021752021 is a deficient number, since it is larger than the sum of its proper divisors (3120778689).

7021752021 is a wasteful number, since it uses less digits than its factorization.

7021752021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780194675 (or 780194672 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 7021752021 is about 83795.8950128227. The cubic root of 7021752021 is about 1914.9105681682.

The spelling of 7021752021 in words is "seven billion, twenty-one million, seven hundred fifty-two thousand, twenty-one".