99471021 has 32 divisors (see below), whose sum is σ = 150135552. Its totient is φ = 58122240.

The previous prime is 99471017. The next prime is 99471091. The reversal of 99471021 is 12017499.

It is not a de Polignac number, because 99471021 - 2² = 99471017 is a prime.

It is a super-5 number, since 5×99471021⁵ (a number of 41 digits) contains 55555 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99471091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154861 + ... + 155501.

It is an arithmetic number, because the mean of its divisors is an integer number (4691736).

Almost surely, 2^99471021 is an apocalyptic number.

It is an amenable number.

99471021 is a deficient number, since it is larger than the sum of its proper divisors (50664531).

99471021 is a wasteful number, since it uses less digits than its factorization.

99471021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 99471021 is about 9973.5159798338. The cubic root of 99471021 is about 463.3390016501.

The spelling of 99471021 in words is "ninety-nine million, four hundred seventy-one thousand, twenty-one".