821295001 has 4 divisors (see below), whose sum is σ = 821367504. Its totient is φ = 821222500.

The previous prime is 821294959. The next prime is 821295019. The reversal of 821295001 is 100592128.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 821295001 - 2²¹ = 819197849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821295071) 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, 15175 + ... + 43276.

It is an arithmetic number, because the mean of its divisors is an integer number (205341876).

Almost surely, 2^821295001 is an apocalyptic number.

It is an amenable number.

821295001 is a deficient number, since it is larger than the sum of its proper divisors (72503).

821295001 is a wasteful number, since it uses less digits than its factorization.

821295001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72502.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 821295001 is about 28658.2449043901. The cubic root of 821295001 is about 936.4826300676.

The spelling of 821295001 in words is "eight hundred twenty-one million, two hundred ninety-five thousand, one".