221210221012221 has 8 divisors (see below), whose sum is σ = 337082241542464. Its totient is φ = 126405840578400.

The previous prime is 221210221012199. The next prime is 221210221012247. The reversal of 221210221012221 is 122210122012122.

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

It is not a de Polignac number, because 221210221012221 - 2⁷ = 221210221012093 is a prime.

It is a super-2 number, since 2×221210221012221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10533820048201 = 221210221012221 / (2 + 2 + 1 + 2 + 1 + 0 + 2 + 2 + 1 + 0 + 1 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210221012421) 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, 5266910024080 + ... + 5266910024121.

It is an arithmetic number, because the mean of its divisors is an integer number (42135280192808).

Almost surely, 2^{221210221012221} is an apocalyptic number.

221210221012221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221210221012221 is a deficient number, since it is larger than the sum of its proper divisors (115872020530243).

221210221012221 is a wasteful number, since it uses less digits than its factorization.

221210221012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10533820048211.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221210221012221 its reverse (122210122012122), we get a palindrome (343420343024343).

Subtracting from 221210221012221 its reverse (122210122012122), we obtain a palindrome (99000099000099).

The spelling of 221210221012221 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".