70052821 has 4 divisors (see below), whose sum is σ = 70114732. Its totient is φ = 69990912.

The previous prime is 70052809. The next prime is 70052831. The reversal of 70052821 is 12825007.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48094225 + 21958596 = 6935^2 + 4686^2 .

It is a cyclic number.

It is not a de Polignac number, because 70052821 - 2⁷ = 70052693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70052831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29226 + ... + 31531.

It is an arithmetic number, because the mean of its divisors is an integer number (17528683).

Almost surely, 2^70052821 is an apocalyptic number.

It is an amenable number.

70052821 is a deficient number, since it is larger than the sum of its proper divisors (61911).

70052821 is a wasteful number, since it uses less digits than its factorization.

70052821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61910.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 70052821 is about 8369.7563285917. The cubic root of 70052821 is about 412.2321660182.

Adding to 70052821 its reverse (12825007), we get a palindrome (82877828).

The spelling of 70052821 in words is "seventy million, fifty-two thousand, eight hundred twenty-one".