821999026 has 16 divisors (see below), whose sum is σ = 1276367040. Its totient is φ = 396562320.

The previous prime is 821998987. The next prime is 821999063. The reversal of 821999026 is 620999128.

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, 104491 + ... + 112081.

It is an arithmetic number, because the mean of its divisors is an integer number (79772940).

Almost surely, 2^821999026 is an apocalyptic number.

821999026 is a deficient number, since it is larger than the sum of its proper divisors (454368014).

821999026 is a wasteful number, since it uses less digits than its factorization.

821999026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9489.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 821999026 is about 28670.5253875823. The cubic root of 821999026 is about 936.7501420998.

The spelling of 821999026 in words is "eight hundred twenty-one million, nine hundred ninety-nine thousand, twenty-six".