821144053 has 4 divisors (see below), whose sum is σ = 823311040. Its totient is φ = 818977068.

The previous prime is 821143991. The next prime is 821144057. The reversal of 821144053 is 350441128.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821144053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821144057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082925 + ... + 1083682.

It is an arithmetic number, because the mean of its divisors is an integer number (205827760).

Almost surely, 2^821144053 is an apocalyptic number.

It is an amenable number.

821144053 is a deficient number, since it is larger than the sum of its proper divisors (2166987).

821144053 is a wasteful number, since it uses less digits than its factorization.

821144053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166986.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 821144053 is about 28655.6111957152. The cubic root of 821144053 is about 936.4252536718.

The spelling of 821144053 in words is "eight hundred twenty-one million, one hundred forty-four thousand, fifty-three".