10511530621 has 2 divisors, whose sum is σ = 10511530622. Its totient is φ = 10511530620.

The previous prime is 10511530619. The next prime is 10511530681. The reversal of 10511530621 is 12603511501.

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., 5477628121 + 5033902500 = 74011^2 + 70950^2 .

It is a cyclic number.

It is not a de Polignac number, because 10511530621 - 2¹ = 10511530619 is a prime.

It is a super-2 number, since 2×10511530621² (a number of 21 digits) contains 22 as substring.

Together with 10511530619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10511530681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255765310 + 5255765311.

It is an arithmetic number, because the mean of its divisors is an integer number (5255765311).

Almost surely, 2^10511530621 is an apocalyptic number.

It is an amenable number.

10511530621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10511530621 is an equidigital number, since it uses as much as digits as its factorization.

10511530621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 10511530621 in words is "ten billion, five hundred eleven million, five hundred thirty thousand, six hundred twenty-one".