821070465 has 16 divisors (see below), whose sum is σ = 1382856000. Its totient is φ = 414856512.

The previous prime is 821070457. The next prime is 821070487. The reversal of 821070465 is 564070128.

It is not a de Polignac number, because 821070465 - 2³ = 821070457 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 1440190 + ... + 1440759.

It is an arithmetic number, because the mean of its divisors is an integer number (86428500).

Almost surely, 2^821070465 is an apocalyptic number.

It is an amenable number.

821070465 is a deficient number, since it is larger than the sum of its proper divisors (561785535).

821070465 is a wasteful number, since it uses less digits than its factorization.

821070465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880976.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 821070465 is about 28654.3271601341. The cubic root of 821070465 is about 936.3972798062.

The spelling of 821070465 in words is "eight hundred twenty-one million, seventy thousand, four hundred sixty-five".