99477721 has 4 divisors (see below), whose sum is σ = 113688832. Its totient is φ = 85266612.

The previous prime is 99477689. The next prime is 99477733. The reversal of 99477721 is 12777499.

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: 12777499 = 7 ⋅1825357.

It is a cyclic number.

It is not a de Polignac number, because 99477721 - 2⁵ = 99477689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99477121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7105545 + ... + 7105558.

It is an arithmetic number, because the mean of its divisors is an integer number (28422208).

Almost surely, 2^99477721 is an apocalyptic number.

It is an amenable number.

99477721 is a deficient number, since it is larger than the sum of its proper divisors (14211111).

99477721 is a wasteful number, since it uses less digits than its factorization.

99477721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14211110.

The product of its digits is 222264, while the sum is 46.

The square root of 99477721 is about 9973.8518637485. The cubic root of 99477721 is about 463.3494043503.

The spelling of 99477721 in words is "ninety-nine million, four hundred seventy-seven thousand, seven hundred twenty-one".