821993054 has 8 divisors (see below), whose sum is σ = 1233113160. Its totient is φ = 410955336.

The previous prime is 821993047. The next prime is 821993071. The reversal of 821993054 is 450399128.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21812 + ... + 46040.

It is an arithmetic number, because the mean of its divisors is an integer number (154139145).

Almost surely, 2^821993054 is an apocalyptic number.

821993054 is a deficient number, since it is larger than the sum of its proper divisors (411120106).

821993054 is a wasteful number, since it uses less digits than its factorization.

821993054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41194.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 821993054 is about 28670.4212386215. The cubic root of 821993054 is about 936.7478735305.

The spelling of 821993054 in words is "eight hundred twenty-one million, nine hundred ninety-three thousand, fifty-four".