99901021443 has 64 divisors (see below), whose sum is σ = 144633600000. Its totient is φ = 61141893120.

The previous prime is 99901021421. The next prime is 99901021447. The reversal of 99901021443 is 34412010999.

It is not a de Polignac number, because 99901021443 - 2⁵ = 99901021411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99901021395 and 99901021404.

It is not an unprimeable number, because it can be changed into a prime (99901021447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 138944038 + ... + 138944756.

It is an arithmetic number, because the mean of its divisors is an integer number (2259900000).

Almost surely, 2^99901021443 is an apocalyptic number.

99901021443 is a deficient number, since it is larger than the sum of its proper divisors (44732578557).

99901021443 is a wasteful number, since it uses less digits than its factorization.

99901021443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 99901021443 in words is "ninety-nine billion, nine hundred one million, twenty-one thousand, four hundred forty-three".