9901344421 has 4 divisors (see below), whose sum is σ = 9988967052. Its totient is φ = 9813721792.

The previous prime is 9901344379. The next prime is 9901344437. The reversal of 9901344421 is 1244431099.

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 4263437025 + 5637907396 = 65295^2 + 75086^2 .

It is a cyclic number.

It is not a de Polignac number, because 9901344421 - 2⁹ = 9901343909 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 (9901344721) 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, 43811146 + ... + 43811371.

It is an arithmetic number, because the mean of its divisors is an integer number (2497241763).

Almost surely, 2^9901344421 is an apocalyptic number.

It is an amenable number.

9901344421 is a deficient number, since it is larger than the sum of its proper divisors (87622631).

9901344421 is a wasteful number, since it uses less digits than its factorization.

9901344421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87622630.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 9901344421 is about 99505.4994510354. The cubic root of 9901344421 is about 2147.3263625988.

The spelling of 9901344421 in words is "nine billion, nine hundred one million, three hundred forty-four thousand, four hundred twenty-one".