822315832021 has 4 divisors (see below), whose sum is σ = 837831225132. Its totient is φ = 806800438912.

The previous prime is 822315831979. The next prime is 822315832067. The reversal of 822315832021 is 120238513228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 598812868900 + 223502963121 = 773830^2 + 472761^2 .

It is a cyclic number.

It is not a de Polignac number, because 822315832021 - 2¹⁹ = 822315307733 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 (822315832081) 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, 7757696476 + ... + 7757696581.

It is an arithmetic number, because the mean of its divisors is an integer number (209457806283).

Almost surely, 2^822315832021 is an apocalyptic number.

It is an amenable number.

822315832021 is a deficient number, since it is larger than the sum of its proper divisors (15515393111).

822315832021 is a wasteful number, since it uses less digits than its factorization.

822315832021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15515393110.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 822315832021 in words is "eight hundred twenty-two billion, three hundred fifteen million, eight hundred thirty-two thousand, twenty-one".