99121973 has 8 divisors (see below), whose sum is σ = 106768896. Its totient is φ = 91753200.

The previous prime is 99121961. The next prime is 99121991. The reversal of 99121973 is 37912199.

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

It is a cyclic number.

It is not a de Polignac number, because 99121973 - 2⁶ = 99121909 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 99121973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68798 + ... + 70223.

It is an arithmetic number, because the mean of its divisors is an integer number (13346112).

Almost surely, 2^99121973 is an apocalyptic number.

It is an amenable number.

99121973 is a deficient number, since it is larger than the sum of its proper divisors (7646923).

99121973 is a wasteful number, since it uses less digits than its factorization.

99121973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139075.

The product of its digits is 30618, while the sum is 41.

The square root of 99121973 is about 9956.0018581758. The cubic root of 99121973 is about 462.7964078057.

The spelling of 99121973 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred seventy-three".