221236809145345 has 32 divisors (see below), whose sum is σ = 304388900379648. Its totient is φ = 151216097883648.

The previous prime is 221236809145307. The next prime is 221236809145409. The reversal of 221236809145345 is 543541908632122.

It is not a de Polignac number, because 221236809145345 - 2⁹ = 221236809144833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159599349 + ... + 160979581.

It is an arithmetic number, because the mean of its divisors is an integer number (9512153136864).

Almost surely, 2^{221236809145345} is an apocalyptic number.

It is an amenable number.

221236809145345 is a deficient number, since it is larger than the sum of its proper divisors (83152091234303).

221236809145345 is a wasteful number, since it uses less digits than its factorization.

221236809145345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395009.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 221236809145345 in words is "two hundred twenty-one trillion, two hundred thirty-six billion, eight hundred nine million, one hundred forty-five thousand, three hundred forty-five".