821077213 has 4 divisors (see below), whose sum is σ = 895720608. Its totient is φ = 746433820.

The previous prime is 821077211. The next prime is 821077277. The reversal of 821077213 is 312770128.

821077213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 821077213 - 2¹ = 821077211 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 (821077211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37321681 + ... + 37321702.

It is an arithmetic number, because the mean of its divisors is an integer number (223930152).

Almost surely, 2^821077213 is an apocalyptic number.

It is an amenable number.

821077213 is a deficient number, since it is larger than the sum of its proper divisors (74643395).

821077213 is a wasteful number, since it uses less digits than its factorization.

821077213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74643394.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 821077213 is about 28654.4449082511. Note that the first 3 decimals coincide. The cubic root of 821077213 is about 936.3998450718.

The spelling of 821077213 in words is "eight hundred twenty-one million, seventy-seven thousand, two hundred thirteen".