9921814679 has 8 divisors (see below), whose sum is σ = 11347929600. Its totient is φ = 8497877976.

The previous prime is 9921814663. The next prime is 9921814717. The reversal of 9921814679 is 9764181299.

9921814679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9921814679 - 2⁴ = 9921814663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921814619) 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 7 ways as a sum of consecutive naturals, for example, 534779 + ... + 553020.

It is an arithmetic number, because the mean of its divisors is an integer number (1418491200).

Almost surely, 2^9921814679 is an apocalyptic number.

9921814679 is a deficient number, since it is larger than the sum of its proper divisors (1426114921).

9921814679 is a wasteful number, since it uses less digits than its factorization.

9921814679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089109.

The product of its digits is 1959552, while the sum is 56.

The square root of 9921814679 is about 99608.3062751295. The cubic root of 9921814679 is about 2148.8051539439.

The spelling of 9921814679 in words is "nine billion, nine hundred twenty-one million, eight hundred fourteen thousand, six hundred seventy-nine".