99921030 has 32 divisors (see below), whose sum is σ = 261612288. Its totient is φ = 24223200.

The previous prime is 99921011. The next prime is 99921047. The reversal of 99921030 is 3012999.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99920982 and 99921000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151066 + ... + 151725.

It is an arithmetic number, because the mean of its divisors is an integer number (8175384).

Almost surely, 2^99921030 is an apocalyptic number.

99921030 is an abundant number, since it is smaller than the sum of its proper divisors (161691258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99921030 is a wasteful number, since it uses less digits than its factorization.

99921030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302812.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 99921030 is about 9996.0507201594. The cubic root of 99921030 is about 464.0366690947.

It can be divided in two parts, 99 and 921030, that added together give a palindrome (921129).

The spelling of 99921030 in words is "ninety-nine million, nine hundred twenty-one thousand, thirty".