821842122 has 16 divisors (see below), whose sum is σ = 1644240960. Its totient is φ = 273854592.

The previous prime is 821842117. The next prime is 821842127. The reversal of 821842122 is 221248128.

It is an interprime number because it is at equal distance from previous prime (821842117) and next prime (821842127).

It is a self number, because there is not a number n which added to its sum of digits gives 821842122.

It is not an unprimeable number, because it can be changed into a prime (821842127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2598 + ... + 40625.

It is an arithmetic number, because the mean of its divisors is an integer number (102765060).

Almost surely, 2^821842122 is an apocalyptic number.

821842122 is an abundant number, since it is smaller than the sum of its proper divisors (822398838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821842122 is a wasteful number, since it uses less digits than its factorization.

821842122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46397.

The product of its digits is 4096, while the sum is 30.

The square root of 821842122 is about 28667.7889276449. The cubic root of 821842122 is about 936.6905357043.

The spelling of 821842122 in words is "eight hundred twenty-one million, eight hundred forty-two thousand, one hundred twenty-two".