70040821 has 8 divisors (see below), whose sum is σ = 73932320. Its totient is φ = 66169872.

The previous prime is 70040813. The next prime is 70040843. The reversal of 70040821 is 12804007.

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

It is a cyclic number.

It is not a de Polignac number, because 70040821 - 2³ = 70040813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70040792 and 70040801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70040801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146 + ... + 12028.

It is an arithmetic number, because the mean of its divisors is an integer number (9241540).

Almost surely, 2^70040821 is an apocalyptic number.

It is an amenable number.

70040821 is a deficient number, since it is larger than the sum of its proper divisors (3891499).

70040821 is a wasteful number, since it uses less digits than its factorization.

70040821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 70040821 is about 8369.0394311414. The cubic root of 70040821 is about 412.2086263120.

Adding to 70040821 its reverse (12804007), we get a palindrome (82844828).

The spelling of 70040821 in words is "seventy million, forty thousand, eight hundred twenty-one".