222001043221 has 4 divisors (see below), whose sum is σ = 222178787500. Its totient is φ = 221823298944.

The previous prime is 222001043219. The next prime is 222001043239. The reversal of 222001043221 is 122340100222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122340100222 = 2 ⋅61170050111.

It can be written as a sum of positive squares in 2 ways, for example, as 146823080625 + 75177962596 = 383175^2 + 274186^2 .

It is a cyclic number.

It is not a de Polignac number, because 222001043221 - 2¹ = 222001043219 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 (222001043261) 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, 88870266 + ... + 88872763.

It is an arithmetic number, because the mean of its divisors is an integer number (55544696875).

Almost surely, 2^222001043221 is an apocalyptic number.

It is an amenable number.

222001043221 is a deficient number, since it is larger than the sum of its proper divisors (177744279).

222001043221 is a wasteful number, since it uses less digits than its factorization.

222001043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177744278.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 222001043221 its reverse (122340100222), we get a palindrome (344341143443).

The spelling of 222001043221 in words is "two hundred twenty-two billion, one million, forty-three thousand, two hundred twenty-one".