99963321 has 4 divisors (see below), whose sum is σ = 133284432. Its totient is φ = 66642212.

The previous prime is 99963317. The next prime is 99963329. The reversal of 99963321 is 12336999.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12336999 = 3 ⋅4112333.

It is a cyclic number.

It is not a de Polignac number, because 99963321 - 2² = 99963317 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99963329) 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, 16660551 + ... + 16660556.

It is an arithmetic number, because the mean of its divisors is an integer number (33321108).

Almost surely, 2^99963321 is an apocalyptic number.

It is an amenable number.

99963321 is a deficient number, since it is larger than the sum of its proper divisors (33321111).

99963321 is a wasteful number, since it uses less digits than its factorization.

99963321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33321110.

The product of its digits is 78732, while the sum is 42.

The square root of 99963321 is about 9998.1658818005. The cubic root of 99963321 is about 464.1021268092.

The spelling of 99963321 in words is "ninety-nine million, nine hundred sixty-three thousand, three hundred twenty-one".