10530821261 has 4 divisors (see below), whose sum is σ = 10535988000. Its totient is φ = 10525654524.

The previous prime is 10530821237. The next prime is 10530821263. The reversal of 10530821261 is 16212803501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16212803501 = 6101 ⋅2657401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10530821261 is a prime.

It is a super-2 number, since 2×10530821261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10530821263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2580311 + ... + 2584388.

It is an arithmetic number, because the mean of its divisors is an integer number (2633997000).

Almost surely, 2^10530821261 is an apocalyptic number.

It is an amenable number.

10530821261 is a deficient number, since it is larger than the sum of its proper divisors (5166739).

10530821261 is an equidigital number, since it uses as much as digits as its factorization.

10530821261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166738.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 10530821261 in words is "ten billion, five hundred thirty million, eight hundred twenty-one thousand, two hundred sixty-one".