10812821 has 2 divisors, whose sum is σ = 10812822. Its totient is φ = 10812820.

The previous prime is 10812797. The next prime is 10812827. The reversal of 10812821 is 12821801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 483025 = 3214^2 + 695^2 .

It is an emirp because it is prime and its reverse (12821801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10812821 - 2¹⁴ = 10796437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10812827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5406410 + 5406411.

It is an arithmetic number, because the mean of its divisors is an integer number (5406411).

Almost surely, 2^10812821 is an apocalyptic number.

It is an amenable number.

10812821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10812821 is an equidigital number, since it uses as much as digits as its factorization.

10812821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 10812821 is about 3288.2854194854. The cubic root of 10812821 is about 221.1293237881.

The spelling of 10812821 in words is "ten million, eight hundred twelve thousand, eight hundred twenty-one".