21020220110101 has 4 divisors (see below), whose sum is σ = 21080449967500. Its totient is φ = 20959990252704.

The previous prime is 21020220110039. The next prime is 21020220110137. The reversal of 21020220110101 is 10101102202012.

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 16344830179876 + 4675389930225 = 4042874^2 + 2162265^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020220110101 - 2¹⁷ = 21020219979029 is a prime.

It is a super-3 number, since 3×21020220110101³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020220110191) 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, 30114928176 + ... + 30114928873.

It is an arithmetic number, because the mean of its divisors is an integer number (5270112491875).

Almost surely, 2^{21020220110101} is an apocalyptic number.

It is an amenable number.

21020220110101 is a deficient number, since it is larger than the sum of its proper divisors (60229857399).

21020220110101 is an equidigital number, since it uses as much as digits as its factorization.

21020220110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60229857398.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21020220110101 its reverse (10101102202012), we get a palindrome (31121322312113).

The spelling of 21020220110101 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred ten thousand, one hundred one".