99197421 has 4 divisors (see below), whose sum is σ = 132263232. Its totient is φ = 66131612.

The previous prime is 99197387. The next prime is 99197447. The reversal of 99197421 is 12479199.

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.

It is a cyclic number.

It is not a de Polignac number, because 99197421 - 2¹³ = 99189229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99197621) 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, 16532901 + ... + 16532906.

It is an arithmetic number, because the mean of its divisors is an integer number (33065808).

Almost surely, 2^99197421 is an apocalyptic number.

It is an amenable number.

99197421 is a deficient number, since it is larger than the sum of its proper divisors (33065811).

99197421 is a wasteful number, since it uses less digits than its factorization.

99197421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33065810.

The product of its digits is 40824, while the sum is 42.

The square root of 99197421 is about 9959.7902086339. The cubic root of 99197421 is about 462.9137992271.

The spelling of 99197421 in words is "ninety-nine million, one hundred ninety-seven thousand, four hundred twenty-one".