16211202002021 has 16 divisors (see below), whose sum is σ = 17884603919280. Its totient is φ = 14598735943680.

The previous prime is 16211202001991. The next prime is 16211202002053. The reversal of 16211202002021 is 12020020211261.

It can be written as a sum of positive squares in 8 ways, for example, as 13623768899521 + 2587433102500 = 3691039^2 + 1608550^2 .

It is a cyclic number.

It is not a de Polignac number, because 16211202002021 - 2¹⁸ = 16211201739877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16211202001984 and 16211202002002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16211202001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16629521 + ... + 17577353.

It is an arithmetic number, because the mean of its divisors is an integer number (1117787744955).

Almost surely, 2^{16211202002021} is an apocalyptic number.

It is an amenable number.

16211202002021 is a deficient number, since it is larger than the sum of its proper divisors (1673401917259).

16211202002021 is a wasteful number, since it uses less digits than its factorization.

16211202002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979976.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 16211202002021 its reverse (12020020211261), we get a palindrome (28231222213282).

The spelling of 16211202002021 in words is "sixteen trillion, two hundred eleven billion, two hundred two million, two thousand, twenty-one".