70207821 has 6 divisors (see below), whose sum is σ = 101411310. Its totient is φ = 46805208.

The previous prime is 70207783. The next prime is 70207829. The reversal of 70207821 is 12870207.

It can be written as a sum of positive squares in only one way, i.e., 68657796 + 1550025 = 8286^2 + 1245^2 .

It is not a de Polignac number, because 70207821 - 2⁷ = 70207693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70207829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3900426 + ... + 3900443.

It is an arithmetic number, because the mean of its divisors is an integer number (16901885).

Almost surely, 2^70207821 is an apocalyptic number.

It is an amenable number.

70207821 is a deficient number, since it is larger than the sum of its proper divisors (31203489).

70207821 is a wasteful number, since it uses less digits than its factorization.

70207821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800875 (or 7800872 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 70207821 is about 8379.0107411317. The cubic root of 70207821 is about 412.5359792309.

It can be divided in two parts, 7020 and 7821, that added together give a palindrome (14841).

The spelling of 70207821 in words is "seventy million, two hundred seven thousand, eight hundred twenty-one".