99953721 has 12 divisors (see below), whose sum is σ = 165003072. Its totient is φ = 57116376.

The previous prime is 99953681. The next prime is 99953731. The reversal of 99953721 is 12735999.

It is a happy number.

99953721 is a `hidden beast` number, since 9 + 99 + 537 + 21 = 666.

It is not a de Polignac number, because 99953721 - 2⁶ = 99953657 is a prime.

It is a super-3 number, since 3×99953721³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99953731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793221 + ... + 793346.

It is an arithmetic number, because the mean of its divisors is an integer number (13750256).

Almost surely, 2^99953721 is an apocalyptic number.

It is an amenable number.

99953721 is a deficient number, since it is larger than the sum of its proper divisors (65049351).

99953721 is a wasteful number, since it uses less digits than its factorization.

99953721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586580 (or 1586577 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 99953721 is about 9997.6857822198. The cubic root of 99953721 is about 464.0872696162.

The spelling of 99953721 in words is "ninety-nine million, nine hundred fifty-three thousand, seven hundred twenty-one".