106556243021 has 4 divisors (see below), whose sum is σ = 106559110332. Its totient is φ = 106553375712.

The previous prime is 106556243011. The next prime is 106556243033. The reversal of 106556243021 is 120342655601.

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 100416736996 + 6139506025 = 316886^2 + 78355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106556243021 is a prime.

It is a super-2 number, since 2×106556243021² (a number of 23 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 (106556243011) 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, 1377170 + ... + 1452483.

It is an arithmetic number, because the mean of its divisors is an integer number (26639777583).

Almost surely, 2^106556243021 is an apocalyptic number.

It is an amenable number.

106556243021 is a deficient number, since it is larger than the sum of its proper divisors (2867311).

106556243021 is an equidigital number, since it uses as much as digits as its factorization.

106556243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867310.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 106556243021 its reverse (120342655601), we get a palindrome (226898898622).

The spelling of 106556243021 in words is "one hundred six billion, five hundred fifty-six million, two hundred forty-three thousand, twenty-one".