221042510105 has 4 divisors (see below), whose sum is σ = 265251012132. Its totient is φ = 176834008080.

The previous prime is 221042510093. The next prime is 221042510119. The reversal of 221042510105 is 501015240122.

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 81517102144 + 139525407961 = 285512^2 + 373531^2 .

It is a de Polignac number, because none of the positive numbers 2^k-221042510105 is a prime.

It is a super-2 number, since 2×221042510105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22104251006 + ... + 22104251015.

It is an arithmetic number, because the mean of its divisors is an integer number (66312753033).

Almost surely, 2^221042510105 is an apocalyptic number.

It is an amenable number.

221042510105 is a deficient number, since it is larger than the sum of its proper divisors (44208502027).

221042510105 is an equidigital number, since it uses as much as digits as its factorization.

221042510105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44208502026.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 221042510105 its reverse (501015240122), we get a palindrome (722057750227).

The spelling of 221042510105 in words is "two hundred twenty-one billion, forty-two million, five hundred ten thousand, one hundred five".