222001121221 has 8 divisors (see below), whose sum is σ = 249995397888. Its totient is φ = 195308904000.

The previous prime is 222001121197. The next prime is 222001121273. The reversal of 222001121221 is 122121100222.

It is a happy number.

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 222001121221 - 2⁵ = 222001121189 is a prime.

It is a super-2 number, since 2×222001121221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222001121195 and 222001121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001125221) 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, 325514500 + ... + 325515181.

It is an arithmetic number, because the mean of its divisors is an integer number (31249424736).

Almost surely, 2^222001121221 is an apocalyptic number.

It is an amenable number.

222001121221 is a deficient number, since it is larger than the sum of its proper divisors (27994276667).

222001121221 is a wasteful number, since it uses less digits than its factorization.

222001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651029723.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 222001121221 its reverse (122121100222), we get a palindrome (344122221443).

The spelling of 222001121221 in words is "two hundred twenty-two billion, one million, one hundred twenty-one thousand, two hundred twenty-one".