99289820421 has 12 divisors (see below), whose sum is σ = 156456686880. Its totient is φ = 60175648680.

The previous prime is 99289820411. The next prime is 99289820447. The reversal of 99289820421 is 12402898299.

99289820421 is a `hidden beast` number, since 99 + 28 + 98 + 20 + 421 = 666.

It is not a de Polignac number, because 99289820421 - 2⁷ = 99289820293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99289820411) 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 11 ways as a sum of consecutive naturals, for example, 501463641 + ... + 501463838.

It is an arithmetic number, because the mean of its divisors is an integer number (13038057240).

Almost surely, 2^99289820421 is an apocalyptic number.

It is an amenable number.

99289820421 is a deficient number, since it is larger than the sum of its proper divisors (57166866459).

99289820421 is a wasteful number, since it uses less digits than its factorization.

99289820421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002927496 (or 1002927493 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 99289820421 in words is "ninety-nine billion, two hundred eighty-nine million, eight hundred twenty thousand, four hundred twenty-one".