222011001221 has 4 divisors (see below), whose sum is σ = 231663653472. Its totient is φ = 212358348972.

The previous prime is 222011001161. The next prime is 222011001253. The reversal of 222011001221 is 122100110222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122100110222 = 2 ⋅61050055111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222011001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222011001196 and 222011001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222011004221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4826326091 + ... + 4826326136.

It is an arithmetic number, because the mean of its divisors is an integer number (57915913368).

Almost surely, 2^222011001221 is an apocalyptic number.

It is an amenable number.

222011001221 is a deficient number, since it is larger than the sum of its proper divisors (9652652251).

222011001221 is an equidigital number, since it uses as much as digits as its factorization.

222011001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9652652250.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 222011001221 its reverse (122100110222), we get a palindrome (344111111443).

The spelling of 222011001221 in words is "two hundred twenty-two billion, eleven million, one thousand, two hundred twenty-one".