221500651205 has 16 divisors (see below), whose sum is σ = 273554392320. Its totient is φ = 172079089728.

The previous prime is 221500651111. The next prime is 221500651271. The reversal of 221500651205 is 502156005122.

It is not a de Polignac number, because 221500651205 - 2¹⁰ = 221500650181 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2940365 + ... + 3014754.

It is an arithmetic number, because the mean of its divisors is an integer number (17097149520).

Almost surely, 2^221500651205 is an apocalyptic number.

It is an amenable number.

221500651205 is a deficient number, since it is larger than the sum of its proper divisors (52053741115).

221500651205 is a wasteful number, since it uses less digits than its factorization.

221500651205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5955340.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 221500651205 its reverse (502156005122), we get a palindrome (723656656327).

The spelling of 221500651205 in words is "two hundred twenty-one billion, five hundred million, six hundred fifty-one thousand, two hundred five".