821224122 has 8 divisors (see below), whose sum is σ = 1642448256. Its totient is φ = 273741372.

The previous prime is 821224087. The next prime is 821224123. The reversal of 821224122 is 221422128.

It is a sphenic number, since it is the product of 3 distinct primes.

821224122 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 821224092 and 821224101.

It is not an unprimeable number, because it can be changed into a prime (821224123) 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, 68435338 + ... + 68435349.

It is an arithmetic number, because the mean of its divisors is an integer number (205306032).

Almost surely, 2^821224122 is an apocalyptic number.

821224122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

821224122 is a wasteful number, since it uses less digits than its factorization.

821224122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136870692.

The product of its digits is 1024, while the sum is 24.

The square root of 821224122 is about 28657.0082527817. The cubic root of 821224122 is about 936.4556893371.

The spelling of 821224122 in words is "eight hundred twenty-one million, two hundred twenty-four thousand, one hundred twenty-two".