21020221101 has 16 divisors (see below), whose sum is σ = 30877593408. Its totient is φ = 12613392000.

The previous prime is 21020221097. The next prime is 21020221121. The reversal of 21020221101 is 10112202012.

It is not a de Polignac number, because 21020221101 - 2² = 21020221097 is a prime.

It is a super-3 number, since 3×21020221101³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020221121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3150016 + ... + 3156681.

It is an arithmetic number, because the mean of its divisors is an integer number (1929849588).

Almost surely, 2^21020221101 is an apocalyptic number.

It is an amenable number.

21020221101 is a deficient number, since it is larger than the sum of its proper divisors (9857372307).

21020221101 is a wasteful number, since it uses less digits than its factorization.

21020221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6306812.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020221101 its reverse (10112202012), we get a palindrome (31132423113).

The spelling of 21020221101 in words is "twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred one".