821128066 has 16 divisors (see below), whose sum is σ = 1344335328. Its totient is φ = 373053600.

The previous prime is 821128027. The next prime is 821128097. The reversal of 821128066 is 660821128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42001 + ... + 58363.

It is an arithmetic number, because the mean of its divisors is an integer number (84020958).

Almost surely, 2^821128066 is an apocalyptic number.

821128066 is a deficient number, since it is larger than the sum of its proper divisors (523207262).

821128066 is a wasteful number, since it uses less digits than its factorization.

821128066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18657.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 821128066 is about 28655.3322437553. The cubic root of 821128066 is about 936.4191764889.

The spelling of 821128066 in words is "eight hundred twenty-one million, one hundred twenty-eight thousand, sixty-six".