821222032 has 10 divisors (see below), whose sum is σ = 1591117718. Its totient is φ = 410611008.

The previous prime is 821221991. The next prime is 821222053. The reversal of 821222032 is 230222128.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 821166336 + 55696 = 28656^2 + 236^2 .

It is a junction number, because it is equal to n+sod(n) for n = 821221994 and 821222012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25663173 + ... + 25663204.

Almost surely, 2^821222032 is an apocalyptic number.

It is an amenable number.

821222032 is a deficient number, since it is larger than the sum of its proper divisors (769895686).

821222032 is a wasteful number, since it uses less digits than its factorization.

821222032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51326385 (or 51326379 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 821222032 is about 28656.9717869841. The cubic root of 821222032 is about 936.4548949157.

The spelling of 821222032 in words is "eight hundred twenty-one million, two hundred twenty-two thousand, thirty-two".