221001000999 has 16 divisors (see below), whose sum is σ = 304066308480. Its totient is φ = 142672592160.

The previous prime is 221001000973. The next prime is 221001001021. The reversal of 221001000999 is 999000100122.

It is not a de Polignac number, because 221001000999 - 2⁵ = 221001000967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001000919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4694589 + ... + 4741430.

It is an arithmetic number, because the mean of its divisors is an integer number (19004144280).

Almost surely, 2^221001000999 is an apocalyptic number.

221001000999 is a deficient number, since it is larger than the sum of its proper divisors (83065307481).

221001000999 is a wasteful number, since it uses less digits than its factorization.

221001000999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9436270.

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 221001000999 in words is "two hundred twenty-one billion, one million, nine hundred ninety-nine", and thus it is an aban number.