222421331123221 has 4 divisors (see below), whose sum is σ = 222421397866092. Its totient is φ = 222421264380352.

The previous prime is 222421331123179. The next prime is 222421331123269. The reversal of 222421331123221 is 122321133124222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50274991716196 + 172146339407025 = 7090486^2 + 13120455^2 .

It is a cyclic number.

It is not a de Polignac number, because 222421331123221 - 2³¹ = 222419183639573 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 (222421331123521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28094530 + ... + 35130403.

It is an arithmetic number, because the mean of its divisors is an integer number (55605349466523).

Almost surely, 2^{222421331123221} is an apocalyptic number.

It is an amenable number.

222421331123221 is a deficient number, since it is larger than the sum of its proper divisors (66742871).

222421331123221 is an equidigital number, since it uses as much as digits as its factorization.

222421331123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66742870.

The product of its digits is 13824, while the sum is 31.

Adding to 222421331123221 its reverse (122321133124222), we get a palindrome (344742464247443).

The spelling of 222421331123221 in words is "two hundred twenty-two trillion, four hundred twenty-one billion, three hundred thirty-one million, one hundred twenty-three thousand, two hundred twenty-one".