99670421 has 4 divisors (see below), whose sum is σ = 100339500. Its totient is φ = 99001344.

The previous prime is 99670397. The next prime is 99670451. The reversal of 99670421 is 12407699.

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 16313521 + 83356900 = 4039^2 + 9130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99670421 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 (99670451) 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, 334316 + ... + 334613.

It is an arithmetic number, because the mean of its divisors is an integer number (25084875).

Almost surely, 2^99670421 is an apocalyptic number.

It is an amenable number.

99670421 is a deficient number, since it is larger than the sum of its proper divisors (669079).

99670421 is a wasteful number, since it uses less digits than its factorization.

99670421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669078.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 99670421 is about 9983.5074497894. The cubic root of 99670421 is about 463.6483987311.

It can be divided in two parts, 996 and 70421, that added together give a palindrome (71417).

The spelling of 99670421 in words is "ninety-nine million, six hundred seventy thousand, four hundred twenty-one".