21020221211001 has 8 divisors (see below), whose sum is σ = 28028669495904. Its totient is φ = 14012626866720.

The previous prime is 21020221210997. The next prime is 21020221211029. The reversal of 21020221211001 is 10011212202012.

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

It is not a de Polignac number, because 21020221211001 - 2² = 21020221210997 is a prime.

It is a super-3 number, since 3×21020221211001³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020221211071) 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, 213427716 + ... + 213526181.

It is an arithmetic number, because the mean of its divisors is an integer number (3503583686988).

Almost surely, 2^{21020221211001} is an apocalyptic number.

It is an amenable number.

21020221211001 is a deficient number, since it is larger than the sum of its proper divisors (7008448284903).

21020221211001 is a wasteful number, since it uses less digits than its factorization.

21020221211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426970311.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020221211001 its reverse (10011212202012), we get a palindrome (31031433413013).

The spelling of 21020221211001 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred eleven thousand, one".