821053466 has 4 divisors (see below), whose sum is σ = 1231580202. Its totient is φ = 410526732.

The previous prime is 821053451. The next prime is 821053487. The reversal of 821053466 is 664350128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 785400625 + 35652841 = 28025^2 + 5971^2 .

It is a super-2 number, since 2×821053466² = 1348257588061226312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205263365 + ... + 205263368.

Almost surely, 2^821053466 is an apocalyptic number.

821053466 is a deficient number, since it is larger than the sum of its proper divisors (410526736).

821053466 is a wasteful number, since it uses less digits than its factorization.

821053466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410526735.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 821053466 is about 28654.0305367325. The cubic root of 821053466 is about 936.3908175402.

The spelling of 821053466 in words is "eight hundred twenty-one million, fifty-three thousand, four hundred sixty-six".