21020221210211 has 8 divisors (see below), whose sum is σ = 21139222302720. Its totient is φ = 20901237559048.

The previous prime is 21020221210207. The next prime is 21020221210259. The reversal of 21020221210211 is 11201212202012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21020221210211 - 2² = 21020221210207 is a prime.

It is a super-3 number, since 3×21020221210211³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020221210211.

It is not an unprimeable number, because it can be changed into a prime (21020221210201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1939331 + ... + 6767676.

It is an arithmetic number, because the mean of its divisors is an integer number (2642402787840).

Almost surely, 2^{21020221210211} is an apocalyptic number.

21020221210211 is a deficient number, since it is larger than the sum of its proper divisors (119001092509).

21020221210211 is a wasteful number, since it uses less digits than its factorization.

21020221210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8720673.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21020221210211 its reverse (11201212202012), we get a palindrome (32221433412223).

The spelling of 21020221210211 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred eleven".