221106015145 has 32 divisors (see below), whose sum is σ = 282655508256. Its totient is φ = 165462835200.

The previous prime is 221106015127. The next prime is 221106015149. The reversal of 221106015145 is 541510601122.

It can be written as a sum of positive squares in 16 ways, for example, as 73168086016 + 147937929129 = 270496^2 + 384627^2 .

It is not a de Polignac number, because 221106015145 - 2¹⁷ = 221105884073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221106015149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10662327 + ... + 10683043.

It is an arithmetic number, because the mean of its divisors is an integer number (8832984633).

Almost surely, 2^221106015145 is an apocalyptic number.

It is an amenable number.

221106015145 is a deficient number, since it is larger than the sum of its proper divisors (61549493111).

221106015145 is a wasteful number, since it uses less digits than its factorization.

221106015145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21501.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 221106015145 its reverse (541510601122), we get a palindrome (762616616267).

The spelling of 221106015145 in words is "two hundred twenty-one billion, one hundred six million, fifteen thousand, one hundred forty-five".