999101424221 has 24 divisors (see below), whose sum is σ = 1096303277160. Its totient is φ = 907329683456.

The previous prime is 999101424161. The next prime is 999101424239. The reversal of 999101424221 is 122424101999.

It can be written as a sum of positive squares in 12 ways, for example, as 313499208100 + 685602216121 = 559910^2 + 828011^2 .

It is not a de Polignac number, because 999101424221 - 2³⁰ = 998027682397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999101424241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23382845 + ... + 23425533.

It is an arithmetic number, because the mean of its divisors is an integer number (45679303215).

Almost surely, 2^999101424221 is an apocalyptic number.

It is an amenable number.

999101424221 is a deficient number, since it is larger than the sum of its proper divisors (97201852939).

999101424221 is a wasteful number, since it uses less digits than its factorization.

999101424221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44401 (or 44372 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 999101424221 in words is "nine hundred ninety-nine billion, one hundred one million, four hundred twenty-four thousand, two hundred twenty-one".