706140021 has 4 divisors (see below), whose sum is σ = 941520032. Its totient is φ = 470760012.

The previous prime is 706140011. The next prime is 706140031. The reversal of 706140021 is 120041607.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (706140011) and next prime (706140031).

It is not a de Polignac number, because 706140021 - 2⁵ = 706139989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 706140021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706140011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117690001 + ... + 117690006.

It is an arithmetic number, because the mean of its divisors is an integer number (235380008).

Almost surely, 2^706140021 is an apocalyptic number.

It is an amenable number.

706140021 is a deficient number, since it is larger than the sum of its proper divisors (235380011).

706140021 is a wasteful number, since it uses less digits than its factorization.

706140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235380010.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 706140021 is about 26573.2952604678. The cubic root of 706140021 is about 890.4925191285.

Adding to 706140021 its reverse (120041607), we get a palindrome (826181628).

The spelling of 706140021 in words is "seven hundred six million, one hundred forty thousand, twenty-one".