21200220101101 has 4 divisors (see below), whose sum is σ = 22447291871772. Its totient is φ = 19953148330432.

The previous prime is 21200220101057. The next prime is 21200220101153. The reversal of 21200220101101 is 10110102200212.

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 18929852214025 + 2270367887076 = 4350845^2 + 1506774^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200220101101 - 2¹⁵ = 21200220068333 is a prime.

It is a super-2 number, since 2×21200220101101² (a number of 27 digits) contains 22 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 (21200220171101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623535885310 + ... + 623535885343.

It is an arithmetic number, because the mean of its divisors is an integer number (5611822967943).

Almost surely, 2^{21200220101101} is an apocalyptic number.

It is an amenable number.

21200220101101 is a deficient number, since it is larger than the sum of its proper divisors (1247071770671).

21200220101101 is a wasteful number, since it uses less digits than its factorization.

21200220101101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247071770670.

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

Adding to 21200220101101 its reverse (10110102200212), we get a palindrome (31310322301313).

The spelling of 21200220101101 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, one hundred one thousand, one hundred one".