221445043505 has 32 divisors (see below), whose sum is σ = 304490918400. Its totient is φ = 151450974720.

The previous prime is 221445043489. The next prime is 221445043513. The reversal of 221445043505 is 505340544122.

It is not a de Polignac number, because 221445043505 - 2⁴ = 221445043489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51968075 + ... + 51972335.

It is an arithmetic number, because the mean of its divisors is an integer number (9515341200).

Almost surely, 2^221445043505 is an apocalyptic number.

It is an amenable number.

221445043505 is a deficient number, since it is larger than the sum of its proper divisors (83045874895).

221445043505 is a wasteful number, since it uses less digits than its factorization.

221445043505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7809.

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 221445043505 its reverse (505340544122), we get a palindrome (726785587627).

The spelling of 221445043505 in words is "two hundred twenty-one billion, four hundred forty-five million, forty-three thousand, five hundred five".