221612342005 has 4 divisors (see below), whose sum is σ = 265934810412. Its totient is φ = 177289873600.

The previous prime is 221612341969. The next prime is 221612342053. The reversal of 221612342005 is 500243216122.

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 104806292644 + 116806049361 = 323738^2 + 341769^2 .

It is not a de Polignac number, because 221612342005 - 2³¹ = 219464858357 is a prime.

It is a super-2 number, since 2×221612342005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 22161234196 + ... + 22161234205.

It is an arithmetic number, because the mean of its divisors is an integer number (66483702603).

Almost surely, 2^221612342005 is an apocalyptic number.

It is an amenable number.

221612342005 is a deficient number, since it is larger than the sum of its proper divisors (44322468407).

221612342005 is an equidigital number, since it uses as much as digits as its factorization.

221612342005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44322468406.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 221612342005 its reverse (500243216122), we get a palindrome (721855558127).

The spelling of 221612342005 in words is "two hundred twenty-one billion, six hundred twelve million, three hundred forty-two thousand, five".