222021001221 has 16 divisors (see below), whose sum is σ = 296395322880. Its totient is φ = 147830459760.

The previous prime is 222021001219. The next prime is 222021001243. The reversal of 222021001221 is 122100120222.

It is not a de Polignac number, because 222021001221 - 2¹ = 222021001219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222021001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222021001291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8352570 + ... + 8379108.

It is an arithmetic number, because the mean of its divisors is an integer number (18524707680).

Almost surely, 2^222021001221 is an apocalyptic number.

It is an amenable number.

222021001221 is a deficient number, since it is larger than the sum of its proper divisors (74374321659).

222021001221 is a wasteful number, since it uses less digits than its factorization.

222021001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29896.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 222021001221 its reverse (122100120222), we get a palindrome (344121121443).

The spelling of 222021001221 in words is "two hundred twenty-two billion, twenty-one million, one thousand, two hundred twenty-one".