821407670822 has 4 divisors (see below), whose sum is σ = 1232111506236. Its totient is φ = 410703835410.

The previous prime is 821407670813. The next prime is 821407670827. The reversal of 821407670822 is 228076704128.

It is a happy number.

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

It is a super-2 number, since 2×821407670822² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821407670827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205351917704 + ... + 205351917707.

It is an arithmetic number, because the mean of its divisors is an integer number (308027876559).

Almost surely, 2^821407670822 is an apocalyptic number.

821407670822 is a deficient number, since it is larger than the sum of its proper divisors (410703835414).

821407670822 is a wasteful number, since it uses less digits than its factorization.

821407670822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410703835413.

The product of its (nonzero) digits is 602112, while the sum is 47.

The spelling of 821407670822 in words is "eight hundred twenty-one billion, four hundred seven million, six hundred seventy thousand, eight hundred twenty-two".