221215550005221 has 8 divisors (see below), whose sum is σ = 294967289252064. Its totient is φ = 147470422047600.

The previous prime is 221215550005201. The next prime is 221215550005231. The reversal of 221215550005221 is 122500055512122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221215550005221 - 2⁵ = 221215550005189 is a prime.

It is a super-2 number, since 2×221215550005221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221215550005201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652744230 + ... + 1652878071.

It is an arithmetic number, because the mean of its divisors is an integer number (36870911156508).

Almost surely, 2^{221215550005221} is an apocalyptic number.

It is an amenable number.

221215550005221 is a deficient number, since it is larger than the sum of its proper divisors (73751739246843).

221215550005221 is a wasteful number, since it uses less digits than its factorization.

221215550005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305644611.

The product of its (nonzero) digits is 20000, while the sum is 33.

The spelling of 221215550005221 in words is "two hundred twenty-one trillion, two hundred fifteen billion, five hundred fifty million, five thousand, two hundred twenty-one".