21001020220211 has 4 divisors (see below), whose sum is σ = 21513240225624. Its totient is φ = 20488800214800.

The previous prime is 21001020220207. The next prime is 21001020220223. The reversal of 21001020220211 is 11202202010012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21001020220211 - 2² = 21001020220207 is a prime.

It is a super-2 number, since 2×21001020220211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001020220231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256110002645 + ... + 256110002726.

It is an arithmetic number, because the mean of its divisors is an integer number (5378310056406).

Almost surely, 2^{21001020220211} is an apocalyptic number.

21001020220211 is a deficient number, since it is larger than the sum of its proper divisors (512220005413).

21001020220211 is an equidigital number, since it uses as much as digits as its factorization.

21001020220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512220005412.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001020220211 its reverse (11202202010012), we get a palindrome (32203222230223).

The spelling of 21001020220211 in words is "twenty-one trillion, one billion, twenty million, two hundred twenty thousand, two hundred eleven".