222221101221021 has 8 divisors (see below), whose sum is σ = 338622630432064. Its totient is φ = 126983486412000.

The previous prime is 222221101221019. The next prime is 222221101221043. The reversal of 222221101221021 is 120122101122222.

222221101221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 222221101221021 - 2¹ = 222221101221019 is a prime.

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: 10581957201001 = 222221101221021 / (2 + 2 + 2 + 2 + 2 + 1 + 1 + 0 + 1 + 2 + 2 + 1 + 0 + 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 (222221101221071) 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, 5290978600480 + ... + 5290978600521.

It is an arithmetic number, because the mean of its divisors is an integer number (42327828804008).

Almost surely, 2^{222221101221021} is an apocalyptic number.

222221101221021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222221101221021 is a deficient number, since it is larger than the sum of its proper divisors (116401529211043).

222221101221021 is a wasteful number, since it uses less digits than its factorization.

222221101221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581957201011.

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

Adding to 222221101221021 its reverse (120122101122222), we get a palindrome (342343202343243).

The spelling of 222221101221021 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, twenty-one".