221121212022221 has 8 divisors (see below), whose sum is σ = 256993176200640. Its totient is φ = 186320052744768.

The previous prime is 221121212022203. The next prime is 221121212022281. The reversal of 221121212022221 is 122220212121122.

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

It is a cyclic number.

It is not a de Polignac number, because 221121212022221 - 2⁶ = 221121212022157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121212022281) 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, 267701224796 + ... + 267701225621.

It is an arithmetic number, because the mean of its divisors is an integer number (32124147025080).

Almost surely, 2^{221121212022221} is an apocalyptic number.

It is an amenable number.

221121212022221 is a deficient number, since it is larger than the sum of its proper divisors (35871964178419).

221121212022221 is an equidigital number, since it uses as much as digits as its factorization.

221121212022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535402450483.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221121212022221 its reverse (122220212121122), we get a palindrome (343341424143343).

The spelling of 221121212022221 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, twenty-two thousand, two hundred twenty-one".