7528694021 has 2 divisors, whose sum is σ = 7528694022. Its totient is φ = 7528694020.

The previous prime is 7528694011. The next prime is 7528694059. The reversal of 7528694021 is 1204968257.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4438890625 + 3089803396 = 66625^2 + 55586^2 .

It is a cyclic number.

It is not a de Polignac number, because 7528694021 - 2³⁰ = 6454952197 is a prime.

It is a super-2 number, since 2×7528694021² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7528694011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3764347010 + 3764347011.

It is an arithmetic number, because the mean of its divisors is an integer number (3764347011).

Almost surely, 2^7528694021 is an apocalyptic number.

It is an amenable number.

7528694021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7528694021 is an equidigital number, since it uses as much as digits as its factorization.

7528694021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 7528694021 is about 86768.0472351430. The cubic root of 7528694021 is about 1959.9269392626.

The spelling of 7528694021 in words is "seven billion, five hundred twenty-eight million, six hundred ninety-four thousand, twenty-one".