221210056221 has 64 divisors (see below), whose sum is σ = 374451849216. Its totient is φ = 112831488000.

The previous prime is 221210056181. The next prime is 221210056229. The reversal of 221210056221 is 122650012122.

It is not a de Polignac number, because 221210056221 - 2¹¹ = 221210054173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221210056191 and 221210056200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210056229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2753421 + ... + 2832621.

It is an arithmetic number, because the mean of its divisors is an integer number (5850810144).

Almost surely, 2^221210056221 is an apocalyptic number.

221210056221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221210056221 is a deficient number, since it is larger than the sum of its proper divisors (153241792995).

221210056221 is a wasteful number, since it uses less digits than its factorization.

221210056221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79442.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 221210056221 its reverse (122650012122), we get a palindrome (343860068343).

The spelling of 221210056221 in words is "two hundred twenty-one billion, two hundred ten million, fifty-six thousand, two hundred twenty-one".