21022000009999 has 16 divisors (see below), whose sum is σ = 21140327342880. Its totient is φ = 20903996943360.

The previous prime is 21022000009987. The next prime is 21022000010003. The reversal of 21022000009999 is 99990000022012.

It is a cyclic number.

It is not a de Polignac number, because 21022000009999 - 2³⁹ = 20472244196111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022000000999) 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, 718858272 + ... + 718887514.

It is an arithmetic number, because the mean of its divisors is an integer number (1321270458930).

Almost surely, 2^{21022000009999} is an apocalyptic number.

21022000009999 is a deficient number, since it is larger than the sum of its proper divisors (118327332881).

21022000009999 is a wasteful number, since it uses less digits than its factorization.

21022000009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34650.

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 21022000009999 in words is "twenty-one trillion, twenty-two billion, nine thousand, nine hundred ninety-nine".