106405322100221 has 4 divisors (see below), whose sum is σ = 106495419749244. Its totient is φ = 106315224451200.

The previous prime is 106405322100199. The next prime is 106405322100299. The reversal of 106405322100221 is 122001223504601.

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 48394478344996 + 58010843755225 = 6956614^2 + 7616485^2 .

It is a cyclic number.

It is not a de Polignac number, because 106405322100221 - 2⁴² = 102007275589117 is a prime.

It is a super-2 number, since 2×106405322100221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106405322105221) 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, 45048822740 + ... + 45048825101.

It is an arithmetic number, because the mean of its divisors is an integer number (26623854937311).

Almost surely, 2^{106405322100221} is an apocalyptic number.

It is an amenable number.

106405322100221 is a deficient number, since it is larger than the sum of its proper divisors (90097649023).

106405322100221 is an equidigital number, since it uses as much as digits as its factorization.

106405322100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90097649022.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 106405322100221 its reverse (122001223504601), we get a palindrome (228406545604822).

The spelling of 106405322100221 in words is "one hundred six trillion, four hundred five billion, three hundred twenty-two million, one hundred thousand, two hundred twenty-one".