21220021211101 has 4 divisors (see below), whose sum is σ = 21220068217500. Its totient is φ = 21219974204704.

The previous prime is 21220021211099. The next prime is 21220021211107. The reversal of 21220021211101 is 10111212002212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12818197223001 + 8401823988100 = 3580251^2 + 2898590^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220021211101 - 2¹ = 21220021211099 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 (21220021211107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22819426 + ... + 23731123.

It is an arithmetic number, because the mean of its divisors is an integer number (5305017054375).

Almost surely, 2^{21220021211101} is an apocalyptic number.

It is an amenable number.

21220021211101 is a deficient number, since it is larger than the sum of its proper divisors (47006399).

21220021211101 is an equidigital number, since it uses as much as digits as its factorization.

21220021211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47006398.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220021211101 its reverse (10111212002212), we get a palindrome (31331233213313).

The spelling of 21220021211101 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred eleven thousand, one hundred one".